1，web.xml中有如下配置：
<!-- 编码过滤器 -->
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<async-supported>true</async-supported>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
2.Controller
@RequestMapping("/test")
@ResponseBody
public String test(HttpServletResponse re){
JSONObject json=new JSONObject();
json.put("msg", "测试");
re.setHeader("Charset", "UTF-8");
re.setContentType("application/x-www-form-urlencoded; charset=utf-8");
return json.toString();
}
3.ajax
$.ajax({
type : "GET",
url : "../cart/test",
data:{},
datatype : "json",
scriptCharset: 'UTF-8',
success : function(result) {
var data = JSON.parse(result);
},
error : function(result) {
var data = JSON.parse(result);
}
仍旧乱码，另外jsp页面、tomcat、项目、General下的Workspace全部设为UTF-8仍旧乱码
最终发现 <mvc:annotation-driven/>
这个意思是说注解驱动，@作用：springMVC为@Controllers分发请求所必须的。
并提供了：数据绑定支持，@NumberFormatannotation支持，@DateTimeFormat支持，@Valid支持，读写XML的支持（JAXB），读写JSON的支持（Jackson）。
<!-- 注解请求映射 -->
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">
<property name="interceptors">
<list>
<ref bean="logNDCInteceptor"/> <!-- 日志拦截器，这是你自定义的拦截器 -->
</list>
</property>
</bean>
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="byteArray_hmc" />
<ref bean="string_hmc" />
<ref bean="resource_hmc" />
<ref bean="source_hmc" />
<ref bean="xmlAwareForm_hmc" />
<ref bean="jaxb2RootElement_hmc" />
<ref bean="jackson_hmc" />
</list>
</property>
</bean>
<bean id="byteArray_hmc" class="org.springframework.http.converter.ByteArrayHttpMessageConverter" /><!-- 处理.. -->
<bean id="string_hmc" class="org.springframework.http.converter.StringHttpMessageConverter" /><!-- 处理.. -->
<bean id="resource_hmc" class="org.springframework.http.converter.ResourceHttpMessageConverter" /><!-- 处理.. -->
<bean id="source_hmc" class="org.springframework.http.converter.xml.SourceHttpMessageConverter" /><!-- 处理.. -->
<bean id="xmlAwareForm_hmc" class="org.springframework.http.converter.xml.XmlAwareFormHttpMessageConverter" /><!-- 处理.. -->
<bean id="jaxb2RootElement_hmc" class="org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter" /><!-- 处理.. -->
<bean id="jackson_hmc" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" /><!-- 处理json-->
其中StringHttpMessageConverter的作用是
看源码：
/*
* Copyright 2002-2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/ package org.springframework.http.converter; import java.io.IOException;
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.util.StreamUtils; /**
* Implementation of {@link HttpMessageConverter} that can read and write strings.
*
* <p>By default, this converter supports all media types ({@code */*}),
* and writes with a {@code Content-Type} of {@code text/plain}. This can be overridden
* by setting the {@link #setSupportedMediaTypes supportedMediaTypes} property.
*
* @author Arjen Poutsma
* @since 3.0
*/
public class StringHttpMessageConverter extends AbstractHttpMessageConverter<String> { public static final Charset DEFAULT_CHARSET = Charset.forName("ISO-8859-1"); private final Charset defaultCharset; private final List<Charset> availableCharsets; private boolean writeAcceptCharset = true; /**
* A default constructor that uses {@code "ISO-8859-1"} as the default charset.
* @see #StringHttpMessageConverter(Charset)
*/
public StringHttpMessageConverter() {
this(DEFAULT_CHARSET);
} /**
* A constructor accepting a default charset to use if the requested content
* type does not specify one.
*/
public StringHttpMessageConverter(Charset defaultCharset) {
super(new MediaType("text", "plain", defaultCharset), MediaType.ALL);
this.defaultCharset = defaultCharset;
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 == clazz;
} @Override
protected String readInternal(Class<? extends String> clazz, HttpInputMessage inputMessage) throws IOException {
Charset charset = getContentTypeCharset(inputMessage.getHeaders().getContentType());
return StreamUtils.copyToString(inputMessage.getBody(), charset);
} @Override
protected Long getContentLength(String str, MediaType contentType) {
Charset charset = getContentTypeCharset(contentType);
try {
return (long) str.getBytes(charset.name()).length;
}
catch (UnsupportedEncodingException ex) {
// should not occur
throw new IllegalStateException(ex);
}
} @Override
protected void writeInternal(String str, HttpOutputMessage outputMessage) throws IOException {
if (this.writeAcceptCharset) {
outputMessage.getHeaders().setAcceptCharset(getAcceptedCharsets());
}
Charset charset = getContentTypeCharset(outputMessage.getHeaders().getContentType());
StreamUtils.copy(str, charset, outputMessage.getBody());
} /**
* Return the list of supported {@link Charset}s.
* <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 this.defaultCharset;
}
} }
方法writeInternal将字符串指定编码输出为响应信息，而这个编码默认的是
public static final Charset DEFAULT_CHARSET = Charset.forName("ISO-8859-1");
所以需要显示的指定编码private final Charset defaultCharset;
因此在<mvc:annotation-driven/>中指定如下：
<mvc:annotation-driven>
<mvc:message-converters register-defaults="true">
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<constructor-arg value="UTF-8" />
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
此时乱码问题解决
另外，也可在@RequestMapping中加入produces="text/html;charset=UTF-8"，如
@RequestMapping(value="/test",,produces="text/html;charset=UTF-8")
@ResponseBody
public String test(HttpServletResponse re){
JSONObject json=new JSONObject();
json.put("msg", "测试"); return json.toString();
}