坑爹的spring3.1加jackson的json中文乱码

web开发遇到json中文乱码，上网查并吸取众长，解决如下：

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("application", "json", 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;
		}
	}
}

springmvc.xml文件里

	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="" />
		<property name="suffix" value="" />
	</bean>
	<!-- 自动扫描且只扫描@Controller -->
	<context:component-scan base-package="com.*" use-default-filters="false">
		<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" />
	</context:component-scan>

	 <mvc:annotation-driven>
		<mvc:message-converters register-defaults="true">
			<bean class="com.ssports.jiangsuapp.util.UTF8StringHttpMessageConverter"/>
		</mvc:message-converters>
	</mvc:annotation-driven> 

	<mvc:default-servlet-handler />