JSONObject简介
本节摘要：之前对JSON做了一次简单的介 绍，并把JSON和XML做了一个简单的比较；那么，我就在想，如果是一个json格式的字符串传到后台，需要怎么对其处理？如果前台页面需要后台返回的 是一个json的字符串，那么后台是怎么把json格式的字符串给拼装起来的呢？JSON和XML是不是有某种联系，他们之间是不是可以互相转换？……带 着这些问题，搜索了相关的资料，并自己实际动手操作，总算对这些问题有了个比较清晰的认识。这些问题主要是通过JSONObject这个插件的jar包实现。
preparation
1.JSONObject介绍
JSONObject-lib包是一个beans,collections,maps,java arrays和xml和JSON互相转换的包。
2.下载jar包
http://files.cnblogs.com/java-pan/lib.rar
提供了除JSONObject的jar之外依赖的其他6个jar包，一共7个jar文件
说明：因为工作中项目用到的版本是1.1的对应jdk1.3的版本，故本篇博客是基于1.1版本介绍的。
对应此版本的javadoc下载路径如下：http://sourceforge.net/projects/json-lib/files/json-lib/json-lib-1.1/
目前最新的版本为2.4,其他版本下载地址为http://sourceforge.net/projects/json-lib/files/json-lib/
3.项目环境：
system：WIN7 myeclipse：6.5 tomcat：5.0 JDK：开发环境和编译用的都是1.5
项目结构如下：
说明：本次用到的的文件只有工程目录json包下的JSONObject_1_3类和note.txt
4.class&method 基于1.1的API
做以下几点约定：
1.介绍基于JSONObject 1.1的API
2.只介绍常用的类和方法
3.不再介绍此版本中已经不再推荐使用
4.介绍的类和方法主要围绕本篇博客中用到的
JSONObject:A JSONObject is an unordered collection of name/value pairs.
是一个final类，继承了Object，实现了JSON接口
构造方法如下：
JSONObject();创建一个空的JSONObject对象
JSONObject(boolean isNull);创建一个是否为空的JSONObject对象
普通方法如下：
fromBean(Object bean);静态方法,通过一个pojo对象创建一个JSONObject对象
fromJSONObject(JSONObject object);静态方法,通过另外一个JSONObject对象构造一个JSONObject对象
fromJSONString(JSONString string);静态方法,通过一个JSONString创建一个JSONObject对象
toString();把JSONObject对象转换为json格式的字符串
iterator();返回一个Iterator对象来遍历元素
接下来就是一些put/get方法，需要普通的get方法和pot方法做一下强调说明，API中是这样描述的：
A get method returns a value if one can be found, and throws an exception if one cannot be found. An opt method returns a default value instead of throwing an exception, and so is useful for obtaining optional values.
JSONArray:A JSONArray is an ordered sequence of values.
是一个final类,继承了Object，实现了JSON接口
构造方法如下：
JSONArray();构造一个空的JSONArray对象
普通方法如下：
fromArray(Object[] array);静态方法,通过一个java数组创建一个JSONArray对象
fromCollection(Collection collection);静态方法,通过collection集合对象创建一个JSONArray对象
fromString(String string);静态方法,通过一个json格式的字符串构造一个JSONArray对象
toString();把JSONArray对象转换为json格式的字符串
iterator();返回一个Iterator对象来遍历元素
接下来同样是put/get方法……
XMLSerializer:Utility class for transforming JSON to XML an back.
一个继承自Object的类
构造方法如下：
XMLSerializer();创建一个XMLSerializer对象
普通方法如下：
setRootName(String rootName);设置转换的xml的根元素名称
setTypeHintsEnabled(boolean typeHintsEnabled);设置每个元素是否显示type属性
write(JSON json);把json对象转换为xml,默认的字符编码是UTF-8,
需要设置编码可以用write(JSON json, String encoding)
start
新建web工程，工程名称JS，导入以下7个jar包，文件在前面的准备工作中下载路径。
说明：可以不用新建web工程，普通的java工程也可以完成本篇的的操作。至于为什么要导入处json包以外的其他6个包，我会把note.txt贴在最后，各位一看便知。
package foo; import net.sf.json.JSON;
import net.sf.json.JSONObject;
import net.sf.json.xml.XMLSerializer; public class JSONObject_1_3 {
public static void javaToJSON() {
System.out.println("java代码封装为json字符串");
JSONObject jsonObj = new JSONObject();
jsonObj.put("username", "张三");
jsonObj.put("password", "123456");
System.out.println("java--->json \n" + jsonObj.toString());
} public static void jsonToJAVA() {
System.out.println("json字符串转java代码");
String jsonStr = "{\"password\":\"123456\",\"username\":\"张三\"}";
JSONObject jsonObj = JSONObject.fromObject(jsonStr);
String username = jsonObj.getString("username");
String password = jsonObj.optString("password");
System.out.println("json--->java\n username=" + username
+ "\t password=" + password);
} public static void jsonToXML() {
System.out.println("json字符串转xml字符串");
String jsonStr = "{\"password\":\"123456\",\"username\":\"张三\"}";
JSONObject json = JSONObject.fromObject(jsonStr);
XMLSerializer xmlSerializer = new XMLSerializer();
xmlSerializer.setRootName("user_info");
xmlSerializer.setTypeHintsEnabled(false);
String xml = xmlSerializer.write(json);
System.out.println("json--->xml \n" + xml);
} public static void javaBeanToJSON() {
System.out.println("javabean转json字符串");
UserInfo userInfo = new UserInfo();
userInfo.setUsername("张三");
userInfo.setPassword("123456");
JSONObject json = JSONObject.fromObject(userInfo);
System.out.println("javabean--->json \n" + json.toString());
} public static void javaBeanToXML() {
System.out.println("javabean转xml字符串");
UserInfo userInfo = new UserInfo();
userInfo.setUsername("张三");
userInfo.setPassword("123456");
JSONObject json = JSONObject.fromObject(userInfo);
XMLSerializer xmlSerializer = new XMLSerializer();
String xml = xmlSerializer.write(json, "UTF-8");
System.out.println("javabean--->xml \n" + xml);
} public static void xmlToJSON() {
System.out.println("xml字符串转json字符串");
String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><user_info><password>123456</password><username>张三</username></user_info>";
XMLSerializer x=new XMLSerializer();
JSON json = x.read(xml);
System.out.println("xml--->json \n" + json.toString());
} public static void Stringtobean() { String jsonStr = "{\"password\":\"123456\",\"username\":\"张三\"}";
JSONObject json = JSONObject.fromObject(jsonStr);
UserInfo userInfo = (UserInfo)JSONObject.toBean(json, UserInfo.class);
System.out.println(userInfo.getUsername());
} public static void main(String args[]) {
javaToJSON();
jsonToJAVA();
jsonToXML();
xmlToJSON();
// //bean的方法有报错，待解决
// javaBeanToJSON();
// javaBeanToXML();
// Stringtobean();
}
} class UserInfo {
public String username;
public String password; public String getUsername() {
return username;
} public void setUsername(String username) {
this.username = username;
} public String getPassword() {
return password;
} public void setPassword(String password) {
this.password = password;
} }
结果
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" alt="" />
result
代码和运行结果都已经贴在每个问题的后面，运行时直接用main方法分别对每个方法运行即可看到测试效果。
note.txt是报的对应的错误及解决方法，也从另一个方面说明为什么需要导入前面提到的jar包；
note.txt文件内容如下：
java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException
at
java.lang.ClassLoader.defineClass0(Native Method)
at
java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at
java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at
java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at
java.security.AccessController.doPrivileged(Native Method)
at
java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at
java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at
java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at
java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at
generate.TestJSONObject.main(TestJSONObject.java:40)
Exception in thread
"main"
解决方案：导入commons-lang-2.1.jar
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at net.sf.json.JSONObject.<clinit>(JSONObject.java:125)
at
generate.TestJSONObject.main(TestJSONObject.java:40)
Exception in thread
"main"
解决方案：导入commons-logging.jar
java.lang.NoClassDefFoundError: org/apache/commons/beanutils/DynaBean
at net.sf.json.JSONObject.set(JSONObject.java:2164)
at
net.sf.json.JSONObject.put(JSONObject.java:1853)
at
net.sf.json.JSONObject.put(JSONObject.java:1806)
at
generate.TestJSONObject.main(TestJSONObject.java:41)
Exception in thread
"main"
解决方案：导入commons-beanutils.jar
java.lang.NoClassDefFoundError: net/sf/ezmorph/MorpherRegistry
at
net.sf.json.util.JSONUtils.<clinit>(JSONUtils.java:65)
at
net.sf.json.JSONObject.set(JSONObject.java:2164)
at
net.sf.json.JSONObject.put(JSONObject.java:1853)
at
net.sf.json.JSONObject.put(JSONObject.java:1806)
at
generate.TestJSONObject.main(TestJSONObject.java:41)
Exception in thread
"main"
解决方案：导入ezmorph-1.0.2.jar
java.lang.NoClassDefFoundError: org/apache/commons/collections/FastHashMap
at
org.apache.commons.beanutils.PropertyUtils.<clinit>(PropertyUtils.java:208)
at net.sf.json.JSONObject.fromBean(JSONObject.java:190)
at
net.sf.json.JSONObject.fromObject(JSONObject.java:437)
at
net.sf.json.JSONObject.set(JSONObject.java:2196)
at
net.sf.json.JSONObject.put(JSONObject.java:1853)
at
net.sf.json.JSONObject.put(JSONObject.java:1806)
at
generate.TestJSONObject.main(TestJSONObject.java:41)
Exception in thread
"main"
解决方案：导入commons-collections-3.0.jar
Exception in thread "main" java.lang.NoClassDefFoundError: nu/xom/Serializer
at generate.TestJSONObject.jsonToXML(TestJSONObject.java:88)
at
generate.TestJSONObject.main(TestJSONObject.java:96)
解决方案：导入xom-1.0d10.jar
几点说明：
1.注意UserInfo类的修饰符,用public修饰,变量username和password也用public修饰，最好单独的写一个类，这里就不贴出来了
2.以上json字符串和xml字符串都是最简单的形式，实际开发中json字符串和xml格式比这个复杂的多，
处理复杂的json字符串，可以封装写一个类继承HashMap，然后重写其put和get方法，以支持对类型为A[0].B及A.B的键值的读取和指定
3.以上6中情况在实际开发中可能有些不存在或不常用
存在的问题：
1.使用XMLSerializer的write方法生成的xml字符串的中文乱码问题
2.question4中的红色的log日志问题
2012-4-6 15:04:35 net.sf.json.xml.XMLSerializer getType
信息: Using default
type string
3.转换bean的方法报错