在spring mvc3中，已经集成了Jackson(json处理器)来处理数据输出json格式,spring中封装的类是 [color=blue]org.springframework.http.converter.json.MappingJackson2HttpMessageConverter[/color]这个json转换器， 如果是[color=red]springmvc3.2[/color]之前的版本,可以使用[color=blue]org.springframework.http.converter.MappingJacksonHttpMessageConverter[/color]这个json转换器。
[size=x-large][color=red]springmvc使用@ResponseBody返回json乱码解决方法[/color][/size] [url]http://www.itxxz.com/a/javashili/ask/2014/1222/501.html[/url]
[color=blue][b]1.springmvc 3.2以上的版本解决乱码的方法：[/b][/color]
[b] 第一步：在配置中加入：[/b]
<mvc:annotation-driven>
<mvc:message-converters register-defaults="true">
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<constructor-arg value="UTF-8" />
</bean>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="objectMapper">
<bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
<property name="failOnEmptyBeans" value="false" />
</bean>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>或者可以这样写
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="jsonRequestConverter" />
</list>
</property>
</bean>
<bean id="jsonRequestConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>[b] 第二步：需要的加入的jackson jar如下：[/b]
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.module</groupId>
<artifactId>jackson-module-jaxb-annotations</artifactId>
<version>2.1.0</version>
</dependency>
[b]另一种方法:[/b], [color=red]貌似偶尔出问题, 还没找原因[/color]
package cn.com.voge.utils;
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.http.converter.HttpMessageNotReadableException;
import org.springframework.http.converter.HttpMessageNotWritableException;
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;
public UTF8StringHttpMessageConverter() {
this(DEFAULT_CHARSET);
}
public UTF8StringHttpMessageConverter(Charset defaultCharset) {
super(new MediaType("text", "plain", defaultCharset), MediaType.ALL);
this.availableCharsets = new ArrayList<Charset>(Charset
.availableCharsets().values());
}
@Override
protected boolean supports(Class<?> clazz) {
return String.class.equals(clazz);
}
@Override
protected String readInternal(Class<? extends String> clazz,
HttpInputMessage inputMessage) throws IOException,
HttpMessageNotReadableException {
MediaType contentType = inputMessage.getHeaders().getContentType();
Charset charset = contentType.getCharSet() != null ? contentType
.getCharSet() : DEFAULT_CHARSET;
return FileCopyUtils.copyToString(new InputStreamReader(inputMessage
.getBody(), charset));
}
@Override
protected void writeInternal(String t, HttpOutputMessage outputMessage)
throws IOException, HttpMessageNotWritableException {
MediaType contentType = outputMessage.getHeaders().getContentType();
Charset charset = contentType.getCharSet() != null ? contentType
.getCharSet() : DEFAULT_CHARSET;
FileCopyUtils.copy(t, new OutputStreamWriter(outputMessage.getBody(),
charset));
}
protected List<Charset> getAcceptedCharsets() {
return this.availableCharsets;
}
@Override
protected Long getContentLength(String s, MediaType contentType) {
if (contentType != null && contentType.getCharSet() != null) {
Charset charset = contentType.getCharSet();
try {
return (long) s.getBytes(charset.name()).length;
} catch (UnsupportedEncodingException ex) {
throw new InternalError(ex.getMessage());
}
} else {
return null;
}
}
}<mvc:annotation-driven>
<mvc:message-converters register-defaults="true">
<bean class="cn.com.voge.utils.UTF8StringHttpMessageConverter"/>
</mvc:message-converters>
</mvc:annotation-driven>[b][color=blue]2.springmvc 3.1解决中文乱码的方法：[/color][/b]
[b] 第一步：在配置文件中加入以下代码： [/b]
<mvc:annotation-driven>
<mvc:message-converters register-defaults="true">
<bean class="com.util.spring.UTF8StringHttpMessageConverter"/>
</mvc:message-converters>
</mvc:annotation-driven>[b] 第二步：自定义一个编码转换类：[/b]
public class UTF8StringHttpMessageConverter extends
AbstractHttpMessageConverter<String> {
public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");
private final List<Charset> availableCharsets;
public UTF8StringHttpMessageConverter() {
this(DEFAULT_CHARSET);
}
public UTF8StringHttpMessageConverter(Charset defaultCharset) {
super(new MediaType("text", "plain", defaultCharset), MediaType.ALL);
this.availableCharsets = new ArrayList<Charset>(Charset .availableCharsets().values());
}
@Override
protected boolean supports(Class<?> clazz) {
return String.class.equals(clazz);
}
@Override
protected String readInternal(Class<? extends String> clazz,
HttpInputMessage inputMessage) throws IOException,
HttpMessageNotReadableException {
MediaType contentType = inputMessage.getHeaders().getContentType();
Charset charset = contentType.getCharSet() != null ? contentType.getCharSet() : DEFAULT_CHARSET;
return FileCopyUtils.copyToString(new InputStreamReader(inputMessage .getBody(), charset));
}
@Override
protected void writeInternal(String t, HttpOutputMessage outputMessage)
throws IOException, HttpMessageNotWritableException {
MediaType contentType = outputMessage.getHeaders().getContentType();
Charset charset = contentType.getCharSet() != null ? contentType .getCharSet() : DEFAULT_CHARSET;
FileCopyUtils.copy(t, new OutputStreamWriter(outputMessage.getBody(), charset));
}
protected List<Charset> getAcceptedCharsets() {
return this.availableCharsets;
}
@Override
protected Long getContentLength(String s, MediaType contentType) {
if (contentType != null && contentType.getCharSet() != null) {
Charset charset = contentType.getCharSet();
try {
return (long) s.getBytes(charset.name()).length;
} catch (UnsupportedEncodingException ex) {
throw new InternalError(ex.getMessage());
}
} else {
return null;
}
}
}[b] 第三步：加入需要的jackson包：[/b]
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.8.8</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.8.8</version>
</dependency>