近日做一个小项目,用spring mvc 做到ajax请求获取jquery ztree 异步获取树返回json对象时出现了乱码,试了各种办法,查了各种资料,一开始以为是数据库的编码有问题,经测试没问题,又以为是jetty需要设置下响 应头,正在查找时突然想到可能是mvc的responseBody的问题,网上一查,果然是,用了一个设置最简单的办法,解决了问题,特将文章转贴于此, 与我一样遇到此问题的朋友们共享。
添加@RequestMapping注解,配置produces的值
@RequestMapping(value = "/add", produces = {"application/json;charset=UTF-8"})
SpringMVC3的ResponseBody返回字符串乱码问题解决
SpringMVC的@ResponseBody注解可以将请求方法返回的对象直接转换成JSON对象,但是当返回值是String的时候,中文会乱码, 原因是因为其中字符串转换和对象转换用的是两个转换器,而String的转换器中固定了转换编码为"ISO-8859-1",网上也很多种解决方法,有通 过配置Bean编码的,也有自己重写转换器的,我这里多次尝试未果,只能自己解决。
有两种解决办法:
1.返回字符串时,将字符串结果转换
return new String("你好".getBytes(), "ISO-8859-1");
2.添加@RequestMapping注解,配置produces的值
@RequestMapping(value = "/add", params = {"callback"}, produces = {"text/javascript;charset=UTF-8"})
以上提供的方法虽然需要额外配置,但相对灵活,喜欢一次性永久搞定的,还是应该考虑网上的方法,修改源码,或者替换默认的字符串转换器。
但是在使用<mvc:annotation-driven />配置的前提下,貌似网上的方法都不可靠,可能跟版本或者配置有关系
这边提供一种修改方法,我这边使用的是3.1的mvc
1.参考网上将默认的StringHttpMessageConverter重写一遍,将其中的编码改为UTF-8
import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.UnsupportedEncodingException; import java.nio.charset.Charset; import java.util.ArrayList; import java.util.List; import org.springframework.http.HttpInputMessage; import org.springframework.http.HttpOutputMessage; import org.springframework.http.MediaType; import org.springframework.http.converter.AbstractHttpMessageConverter; import org.springframework.util.FileCopyUtils; public class UTF8StringHttpMessageConverter extends AbstractHttpMessageConverter<String> { public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8"); private final List<Charset> availableCharsets; private boolean writeAcceptCharset = true; public UTF8StringHttpMessageConverter() { super(new MediaType("text", "plain", DEFAULT_CHARSET), MediaType.ALL); this.availableCharsets = new ArrayList<Charset>(Charset.availableCharsets().values()); } /** * Indicates whether the {@code Accept-Charset} should be written to any outgoing request. * <p>Default is {@code true}. */ public void setWriteAcceptCharset(boolean writeAcceptCharset) { this.writeAcceptCharset = writeAcceptCharset; } @Override public boolean supports(Class<?> clazz) { return String.class.equals(clazz); } @Override protected String readInternal(Class clazz, HttpInputMessage inputMessage) throws IOException { Charset charset = getContentTypeCharset(inputMessage.getHeaders().getContentType()); return FileCopyUtils.copyToString(new InputStreamReader(inputMessage.getBody(), charset)); } @Override protected Long getContentLength(String s, MediaType contentType) { Charset charset = getContentTypeCharset(contentType); try { return (long) s.getBytes(charset.name()).length; } catch (UnsupportedEncodingException ex) { // should not occur throw new InternalError(ex.getMessage()); } } @Override protected void writeInternal(String s, HttpOutputMessage outputMessage) throws IOException { if (writeAcceptCharset) { outputMessage.getHeaders().setAcceptCharset(getAcceptedCharsets()); } Charset charset = getContentTypeCharset(outputMessage.getHeaders().getContentType()); FileCopyUtils.copy(s, new OutputStreamWriter(outputMessage.getBody(), charset)); } /** * Return the list of supported {@link Charset}. * * <p>By default, returns {@link Charset#availableCharsets()}. Can be overridden in subclasses. * * @return the list of accepted charsets */ protected List<Charset> getAcceptedCharsets() { return this.availableCharsets; } private Charset getContentTypeCharset(MediaType contentType) { if (contentType != null && contentType.getCharSet() != null) { return contentType.getCharSet(); } else { return DEFAULT_CHARSET; } } }
2.context配置
<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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd"> <mvc:annotation-driven> <mvc:message-converters> <bean class="yourpackage.UTF8StringHttpMessageConverter" /> </mvc:message-converters> </mvc:annotation-driven> ...... </beans>
转载于:https://www.cnblogs.com/coprince/p/3490199.html