spring mvc工作流
1A)客户端发出http请求,只要请求形式符合web.xml
文件中配置的*.action的话,就由DispatcherServlet
来处理。
1B)DispatcherServlet再将http请求委托给映射器
的对象来将http请求交给对应的Action来处理
2)映射器根据客户的http请求,再对比<bean name="/hello.action
如果匹配正确,再将http请求交给程序员写的Action
3)执行Action中的业务方法,最终返回一个名叫ModelAndView
的对象,其中封装了向视图发送的数据和视图的逻辑名
4)ModelAndView对象随着响应到到DispatcherServlet中了
5)这时DispatcherServlet收到了ModelAndView对象,
它也不知道视图逻辑名是何意,又得委托一个名叫
视图解析器的对象去具体解析ModelAndView对象
中的内容
6)将视图解析器解析后的内容,再次交由DispatcherServlet
核心控制器,这时核心控制器再将请求转发到具体的
视图页面,取出数据,再显示给用户
springmvc快速入门(注解版本)
步骤一:创建springmvc-day02这么一个web应用
步骤二:导入springioc,springweb和springmvc相关的jar包
------------------------------------------------------springWEB模块 org.springframework.web-3.0.5.RELEASE.jar org.springframework.web.servlet-3.0.5.RELEASE.jar(mvc专用) ------------------------------------------------------springIOC模块 org.springframework.asm-3.0.5.RELEASE.jar org.springframework.beans-3.0.5.RELEASE.jar org.springframework.context-3.0.5.RELEASE.jar org.springframework.core-3.0.5.RELEASE.jar org.springframework.expression-3.0.5.RELEASE.jar
步骤三:在/WEB-INF/下创建web.xml文件
<servlet> <servlet-name>DispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> 注意:不在这配置初始化参数的话,默认是去/WEB-INF/ 目录下查找DispatcherServlet-serlvet.xml的配置文件,且是固定的文件名。 <param-name>contextConfigLocation</param-name> <param-value>classpath:spring.xml</param-value> 一般是在src下的spring.xml配置文件中引入其他的springmvc.xml </init-param> </servlet> <servlet-mapping> <servlet-name>DispatcherServlet</servlet-name> <url-pattern>*.action</url-pattern> </servlet-mapping>
步骤四:创建HelloAction.java控制器类
传统方式是实现Controller接口的方法,由于是重新了handRequest方法,因此一个action只能有一个handRequest方法。
注解方式没有实现接口或者继承类,所以可以有很多方法,方法名任意,而且方法的返回值不再是ModelAndView,这类似struts2
但是方法可以带参数,也可以不带,这点不同struts2,struts2的方法不能有参数。
@Controller public class HelloAction{ @RequestMapping(value="/hello") 路径为/hello的请求交给该方法处理。 注意:(value={"/a.action","/b.action"})表示多个路径都交给该方法处理
其中value=可以省略,直接{..},因为如果注解的属性是value,value可以省略 public String helloMethod(Model model) throws Exception{ System.out.println("HelloAction::helloMethod()"); model.addAttribute("message","这是我的第二个springmvc应用程序"); return "/success.jsp";注意:如果配置了视图解析器,前缀,后缀等,可以直接return "success"; 类似struts2,
如果不配置视图解析器,直接return "success";会报404错误。 } }
注意:Model是spring ui中的一个实体模型,放到model中的数据可以在jsp中取出来。
步骤五:在/WebRoot/下创建success.jsp
<%@ page language="java" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>这是我的第二个springmvc应用程序</title> </head> <body> success.jsp<br/> ${message} </body> </html>
步骤六:在/src/目录下创建spring.xml配置文件
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd "> <!-- Action控制器 --> 让spring ioc容器去扫描带有@Controller的类 <context:component-scan base-package="cn.itcast.javaee.springmvc.helloannotation"/> <!-- 基于注解的映射器(可选) --> <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/> <!-- 基于注解的适配器(可选) --> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/> <!-- 视图解析器(可选) --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"/> </beans>
步骤七:部署web应用到tomcat中,通过浏览器访问如下URL:
http://127.0.0.1:8080/springmvc-day02/hello.action
一个Action中,可以写多个类似的业务控制方法
通过模块根路径 + 功能子路径 = 访问模块下子功能的路径
@Controller @RequestMapping(value="/user") 这里类似配置Struts2的namespace public class UserAction{ @RequestMapping(value="/add") public String add(Model model) throws Exception{ System.out.println("HelloAction::add()"); model.addAttribute("message","增加用户"); return "/success.jsp"; } @RequestMapping(value="/find") public String find(Model model) throws Exception{ System.out.println("HelloAction::find()"); model.addAttribute("message","查询用户"); return "/success.jsp"; } }
增加用户:http://127.0.0.1:8080/myspringmvc-day02/user/add.action
查询用户:http://127.0.0.1:8080/myspringmvc-day02/user/find.action
在业务控制方法中写入普通变量收集表单提交的数据
可以在业务控制方法中,以参数形式收集客户端参数,springmvc采用方法参数形式的
/** * 控制器 * @author AdminTC */ @Controller @RequestMapping(value="/user") public class UserAction { /** * 用户注册,只能接收POST请求 */ @RequestMapping(method=RequestMethod.POST,value="/register") public String registerMethod(Model model,String username,String salary) throws Exception{ System.out.println("用户注册-->" + username + ":" + salary); 会自动的去扫描jsp页面提交的数据是否包含同名的参数,如果有,用该值 model.addAttribute("message","员工注册成功"); return "/jsp/success.jsp";//视图是真实路径,可以不配做视图解析器 } /** * 用户登录,即能接收POST请求,又能接收GET请求 */ @RequestMapping(value="/login") public String loginMethod(Model model,String username) throws Exception{ System.out.println("用户登录-->" + username); model.addAttribute("message","员工登录成功"); return "/jsp/success.jsp"; } }
注意:原则:
1. javabean中的属性一般用包装类型,Integer,Double
2. 普通方法中的参数类型一般用基础类型,int,double
<%@ page language="java" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <body> <form action="${pageContext.request.contextPath}/user/register.action" method="POST"> <table border="2" align="center"> <caption><h2>用户注册</h2></caption> <tr> <th>姓名</th> <td><input type="text" name="username"/></td> </tr> <tr> <th>月薪</th> <td><input type="text" name="salary" value="7000"/></td> </tr> <tr> <th>入职时间</th> <td><input type="text" name="hiredate" value="2015-5-11 12:12:12"/></td> </tr> <tr> <td colspan="2" align="center"> <input type="submit" value="注册" style="width:111px"/> </td> </tr> </table> </form> <hr/> <form action="${pageContext.request.contextPath}/user/login.action" method="POST"> <table border="2" align="center"> <caption><h2>用户登录</h2></caption> <tr> <th>姓名</th> <td><input type="text" name="username"/></td> </tr> <tr> <td colspan="2" align="center"> <input type="submit" value="登录" style="width:111px"/> </td> </tr> </table> </form> </body> </html>
@Controller @RequestMapping(value="/user") public class UserAction{ @RequestMapping(value="/add") public String add(Model model,int id,String name,Double sal) throws Exception{ System.out.println("HelloAction::add()"); System.out.println(id + ":" + name + ":" + sal); model.addAttribute("message","增加用户"); return "/success.jsp"; } }
http://127.0.0.1:8080/myspringmvc-day02/user/add.action?id=1&name=zhaojun&sal=5000
限定某个业务控制方法,只允许GET或POST请求方式访问
可以在业务控制方法前,指明该业务控制方法只能接收GET或POST的请求
@Controller @RequestMapping(value="/user") public class UserAction{ @RequestMapping(value="/add",method=RequestMethod.POST) public String add(Model model,int id,String name,double sal) throws Exception{ System.out.println("HelloAction::add()::POST"); System.out.println(id + ":" + name + ":" + sal); model.addAttribute("message","增加用户"); return "/success.jsp"; } }
如果不书写method=RequestMethod.POST的话,GET和POST请求都支持
在业务控制方法中写入Request,Response,Model等传统web参数
可以在业务控制方法中书写传统web参数,这种方式我们不提倡,耦合了
@Controller @RequestMapping(value="/user") public class UserAction{ @RequestMapping(value="/add",method=RequestMethod.POST) public void add(HttpServletRequest request,HttpServletResponse response) throws Exception{ System.out.println("HelloAction::add()::POST"); int id = Integer.parseInt(request.getParameter("id")); String name = request.getParameter("name"); double sal = Double.parseDouble(request.getParameter("sal")); System.out.println(id + ":" + name + ":" + sal); request.getSession().setAttribute("id",id); request.getSession().setAttribute("name",name); request.getSession().setAttribute("sal",sal); response.sendRedirect(request.getContextPath()+"/register.jsp"); } }
返回值可以是void,String struts2只能返回String
在业务控制方法中写入模型变量收集参数,且使用@InitBind来解决字符串转日期类型
1) 在默认情况下,springmvc不能将String类型转成java.util.Date类型,所有我们只能在Action
中自定义类型转换器
<form action="${pageContext.request.contextPath}/user/add.action" method="POST"> 编号:<input type="text" name="id" value="${id}"/><br/> 姓名:<input type="text" name="name" value="${name}"/><br/> 薪水:<input type="text" name="sal" value="${sal}"/><br/> 入职时间:<input type="text" name="hiredate" value='<fmt:formatDate value="${hiredate}" type="date"/>'/><br/> <input type="submit" value="注册"/> </form>
@Controller @RequestMapping(value = "/user") public class UserAction { @InitBinder protected void initBinder(HttpServletRequest request,ServletRequestDataBinder binder) throws Exception { binder.registerCustomEditor( Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"),true)); } @RequestMapping(value = "/add", method = RequestMethod.POST) public String add(int id, String name, double sal, Date hiredate, Model model) throws Exception { System.out.println("HelloAction::add()::POST"); model.addAttribute("id", id); model.addAttribute("name", name); model.addAttribute("sal", sal); model.addAttribute("hiredate", hiredate); return "/register.jsp"; } }
在业务控制方法中写入User,Admin多个模型收集参数
1) 可以在业务控制方法中书写1个模型来收集客户端的参数
2) 模型中的属性名必须和客户端参数名一一对应
3) 这里说的模型不是Model对象,Model是向视图中封装的数据
@Controller @RequestMapping(value = "/user") public class UserAction { @InitBinder protected void initBinder(HttpServletRequest request,ServletRequestDataBinder binder) throws Exception { binder.registerCustomEditor( Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"),true)); } @RequestMapping(value = "/add", method = RequestMethod.POST) public String add(User user,Model model) throws Exception { System.out.println("HelloAction::add()::POST"); model.addAttribute("user",user); return "/register.jsp"; } }
在业务控制方法中写入包装User的模型来收集参数
如果多个模型含有一些相同的字段,同时又都交给同一个action处理,该如何做。
可以在业务控制方法中书写0个或多个模型来收集客户端的参数
1) 如果多个模型中有相同的属性时,可以用user.name或admin.name来收集客户端参数
2) 用一个新的模型将User和Admin再封装一次
/** * 普通用户 * @author AdminTC */ public class User { private String username; private Double salary; private Date hiredate; public User(){} public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public Double getSalary() { return salary; } public void setSalary(Double salary) { this.salary = salary; } public Date getHiredate() { return hiredate; } public void setHiredate(Date hiredate) { this.hiredate = hiredate; } @Override public String toString() { return this.username+":"+this.salary+":"+this.hiredate.toLocaleString(); } }
/** * 管理员 * @author AdminTC */ public class Admin { private String username; private Double salary; private Date hiredate; public Admin(){} public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public Double getSalary() { return salary; } public void setSalary(Double salary) { this.salary = salary; } public Date getHiredate() { return hiredate; } public void setHiredate(Date hiredate) { this.hiredate = hiredate; } @Override public String toString() { return this.username+":"+this.salary+":"+this.hiredate.toLocaleString(); } }
/** * 封装User和Admin的对象 * @author AdminTC */ public class Bean { private User user; private Admin admin; public Bean(){} public User getUser() { return user; } public void setUser(User user) { this.user = user; } public Admin getAdmin() { return admin; } public void setAdmin(Admin admin) { this.admin = admin; } }
/** * 控制器 * @author AdminTC */ @Controller @RequestMapping(value="/person") public class PersonAction { @InitBinder public void initBinder(HttpServletRequest request,ServletRequestDataBinder binder) throws Exception { binder.registerCustomEditor( Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"),true)); } /** * 业务方法 */ @RequestMapping(value="/register") public String registerMethod(Bean bean,Model model) throws Exception{ 也可以使用参数(User user,Admin admin,Model,model)来处理 System.out.println("普通用户:" + bean.getUser()); System.out.println("管理员:" + bean.getAdmin()); //将user和admin都绑定到Model 注意:spring mvc中一般使用Model传值,不用request,session了 model.addAttribute("user",bean.getUser()); model.addAttribute("admin",bean.getAdmin()); //转发 return "/02_person.jsp"; } }
<%@ page language="java" pageEncoding="UTF-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <body> 普通用户 <form action="${pageContext.request.contextPath}/person/register.action" method="POST"> <table border="2" align="center"> <tr> <th>姓名</th> <td><input type="text" name="user.username" value="${user.username}"/></td> </tr> <tr> <th>月薪</th> <td><input type="text" name="user.salary" value="${user.salary}"></td> </tr> <tr> <th>入职时间</th> <td><input type="text" name="user.hiredate" value='<fmt:formatDate value="${user.hiredate}" type="date" dateStyle="default"/>'/></td> </tr> <tr> <td colspan="2" align="center"> <input type="submit" value="普通用户注册" style="width:111px"/> </td> </tr> </table> </form> <hr/> 管理员 <form action="${pageContext.request.contextPath}/person/register.action" method="POST"> <table border="2" align="center"> <tr> <th>姓名</th> <td><input type="text" name="admin.username" value="${admin.username}"/></td> </tr> <tr> <th>月薪</th> <td><input type="text" name="admin.salary" value="${admin.salary}"/></td> </tr> <tr> <th>入职时间</th> <td><input type="text" name="admin.hiredate" value='<fmt:formatDate value="${admin.hiredate}" type="date" dateStyle="default"/>'/></td> </tr> <tr> <td colspan="2" align="center"> <input type="submit" value="管理员注册" style="width:111px"/> </td> </tr> </table> </form> </body> </html>
在业务控制方法中收集数组参数
如批量删除,类似struts2 用数组来收集
<%@ page language="java" pageEncoding="UTF-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <body> <form action="${pageContext.request.contextPath}/emp/deleteAll.action" method="POST"> <table border="2" align="center"> <tr> <th>编号</th> <th>姓名</th> </tr> <tr> <td><input type="checkbox" name="ids" value="1"/></td> <td>哈哈</td> </tr> <tr> <td><input type="checkbox" name="ids" value="2"/></td> <td>呵呵</td> </tr> <tr> <td><input type="checkbox" name="ids" value="3"/></td> <td>嘻嘻</td> </tr> <tr> <td><input type="checkbox" name="ids" value="4"/></td> <td>笨笨</td> </tr> <tr> <td><input type="checkbox" name="ids" value="5"/></td> <td>聪聪</td> </tr> <tr> <td> <input type="submit" value="删除"/> </td> </tr> </table> </form> </body> </html>
package cn.itcast.javaee.springmvc.app22; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; @Controller @RequestMapping(value="/emp") public class EmpAction { @RequestMapping(value="/deleteAll",method=RequestMethod.POST) public String deleteAll(Model model,int[] ids) throws Exception{ System.out.println("需要删除的员工编号分别是:"); for(int id : ids){ System.out.print(id+" "); } model.addAttribute("message","批量删除员工成功"); return "/jsp/ok.jsp"; } }
在业务控制方法中收集List<JavaBean>参数
如批量注册用户等
registerAll.java
<form action="${pageContext.request.contextPath}/user/addAll.action" method="POST"> 姓名:<input type="text" name="userList[0].name" value="哈哈"/> 性别:<input type="text" name="userList[0].gender" value="男"/> <hr/> 姓名:<input type="text" name="userList[1].name" value="呵呵"/> 性别:<input type="text" name="userList[1].gender" value="男"/> <hr/> 姓名:<input type="text" name="userList[2].name" value="嘻嘻"/> 性别:<input type="text" name="userList[2].gender" value="女"/> <hr/> <input type="submit" value="批量注册"/> </form>
Bean.java
public class Bean { private List<User> userList = new ArrayList<User>(); public Bean(){} public List<User> getUserList() { return userList; } public void setUserList(List<User> userList) { this.userList = userList; } }
UserAction.java
@Controller @RequestMapping(value="/user") public class UserAction { @RequestMapping(value="/addAll") public String addAll(Bean bean,Model model) throws Exception{ for(User user : bean.getUserList()){ System.out.println(user.getName()+":"+user.getGender()); } model.addAttribute("message","批量增加用户成功"); return "/success.jsp"; } }
结果的转发和重定向
删除id=10号的用户,再查询用户
@Controller @RequestMapping(value="/user") public class UserAction { @RequestMapping(value="/delete") public String delete(int id) throws Exception{ System.out.println("删除用户->" + id); //转发到find() 注意:转发的时候,从delete(int id) 转发到find(int id),可以不在find.action?id=10后面跟上id=10,会自动传入。 return "forward:/user/find.action"; //重定向到find() //return "redirect:/user/find.action"; } @RequestMapping(value="/find") public String find(int id) throws Exception{ System.out.println("查询用户->" + id); return "/success.jsp"; } }
异步发送表单数据,并响应JSON文本返回
1) 导入两个包
jackson-core-asl-1.9.11.jar
jackson-mapper-asl-1.9.11.jar
2)在业务方法的返回值和权限之间使用@ResponseBody注解表示返回值对象需要转成JSON文本
3)在spring.xml配置文件中编写如下代码:
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/>
</list>
</property>
</bean>
4) 提交表单后,将JavaBean/list/Map 信息以JSON文本形式返回到浏览器
<%@ page language="java" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <script type="text/javascript" src="js/jquery-1.8.2.js"></script> </head> <body> <input type="button" value="Emp转JSON"/><p> <input type="button" value="List<Emp>转JSON"/><p> <input type="button" value="Map<String,Object>转JSON"/><p> <!-- Map<String,Object>转JSON --> <script type="text/javascript"> $(":button:last").click(function(){ var url = "${pageContext.request.contextPath}/emp/map2json.action"; var sendData = null; $.post(url,sendData,function(backData,textStaut,ajax){ alert(ajax.responseText); }); }); </script> <!-- List<Emp>转JSON --> <script type="text/javascript"> $(":button:eq(1)").click(function(){ var url = "${pageContext.request.contextPath}/emp/listbean2json.action"; var sendData = null; $.post(url,sendData,function(backData,textStaut,ajax){ alert(ajax.responseText); }); }); </script> <!-- Emp转JSON --> <script type="text/javascript"> $(":button:first").click(function(){ var url = "${pageContext.request.contextPath}/emp/bean2json.action"; var sendData = null;//表示发送的数据,不发送数据,为null $.post(url,sendData,function(backData,textStaut,ajax){ //alert(ajax.responseText);获取json对象值 var hiredate = backData.hiredate; var date = new Date(hiredate); alert(date.getFullYear()+"年"+(date.getMonth()+1)+"月"+(date.getDate())+"日"); }); }); </script> </body> </html>
public class Emp { private Integer id; private String username; private Double salary; private Date hiredate; public Emp(){} public Emp(Integer id, String username, Double salary, Date hiredate) { this.id = id; this.username = username; this.salary = salary; this.hiredate = hiredate; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public Double getSalary() { return salary; } public void setSalary(Double salary) { this.salary = salary; } public Date getHiredate() { return hiredate; } public void setHiredate(Date hiredate) { this.hiredate = hiredate; } }
@Controller @RequestMapping(value="/emp") public class EmpAction { /** * @ResponseBody Emp 表示让springmvc将Emp对象转成json文本 */ @RequestMapping(value="/bean2json") public @ResponseBody Emp bean2json() throws Exception{ //创建Emp对象 Emp emp = new Emp(); emp.setId(); emp.setUsername("哈哈"); emp.setSalary(7000D); emp.setHiredate(new Date()); return emp; } @RequestMapping(value="/listbean2json") public @ResponseBody List<Emp> listbean2json() throws Exception{ //创建List对象 List<Emp> empList = new ArrayList<Emp>(); //向List对象中添加三个Emp对象 empList.add(,"哈哈",7000D,new Date())); empList.add(,"呵呵",8000D,new Date())); empList.add(,"嘻嘻",9000D,new Date())); //返回需要转JSON文本的对象 return empList; } @RequestMapping(value="/map2json") public @ResponseBody Map<String,Object> map2json() throws Exception{ //创建List对象 List<Emp> empList = new ArrayList<Emp>(); //向List对象中添加三个Emp对象 empList.add(,"哈哈",7000D,new Date())); empList.add(,"呵呵",8000D,new Date())); empList.add(,"嘻嘻",9000D,new Date())); //创建Map对象 Map<String,Object> map = new LinkedHashMap<String,Object>(); //向Map对象中绑定二个变量 map.put("total",empList.size()); map.put("rows",empList); //返回需要转JSON文本的对象 return map; } }
spring.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd "> <!-- EmpAction类 --> <context:component-scan base-package="cn.itcast.javaee.springmvc.app25"/> <!-- 注册适配器 --> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <list> <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/> </list> </property> </bean> <!-- 1)导入jackson-core-asl-1.9.11.jar和jackson-mapper-asl-1.9.11.jar 2)在业务方法的返回值和权限之间使用@ResponseBody注解表示返回值对象需要转成JSON文本 3)在spring.xml配置文件中编写如下代码: <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <list> <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/> </list> </property> </bean> --> </beans>
bean2json.jsp
<form> 编号:<input type="text" name="id" value="1"/><br/> 姓名:<input type="text" name="name" value="哈哈"/><br/> 薪水:<input type="text" name="sal" value="5000"/><br/> <input type="button" value="异步提交注册"/> </form> <script type="text/javascript"> $(":button").click(function(){ var url = "${pageContext.request.contextPath}/user/add.action"; var sendData = { "id":1, "name":"哈哈", "sal":5000 }; $.post(url,sendData,function(backData,textStatus,ajax){ alert(ajax.responseText); }); }); </script>
User.java
public class User { private Integer id; private String name; private Double sal; public User(){} public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Double getSal() { return sal; } public void setSal(Double sal) { this.sal = sal; } }
UserAction.java
@Controller @RequestMapping(value="/user") public class UserAction { @RequestMapping(value="/add") public @ResponseBody User add(User user) throws Exception{ System.out.println(user.getId()+":"+user.getName()+":"+user.getSal()); return user; } }
spring.xml
<!-- Action控制器 --> <context:component-scan base-package="cn.itcast.javaee.springmvc.app25"/> <!-- 配适器 --> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <list> <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/> </list> </property> </bean>