详解Spring MVC3返回JSON数据中文乱码问题解决

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import com.fasterxml.jackson.databind.ObjectMapper; //Jsckson JSON Processer

import java.util.*;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.*;
import java.io.PrintWriter;
import java.nio.charset.Charset;

/**
 * Created with IntelliJ IDEA 12.0
 * Date: 2013-03-15
 * Time: 16:17
 */
@Controller
public class HomeController {
  @RequestMapping(value="/Home/writeJson", method=RequestMethod.GET)
  public void writeJson(HttpServletResponse response)
  {
    ObjectMapper mapper = new ObjectMapper();

    HashMap<String,String> map = new HashMap<String,String>();
    map.put("1","张三");
    map.put("2","李四");
    map.put("3","王五");
    map.put("4", "Jackson");

    String json = "";

    try
    {
      json = mapper.writeValueAsString(map);
      System.out.println(json);

      //方案二
      ServletOutputStream os = response.getOutputStream(); //获取输出流
      os.write(json.getBytes(Charset.forName("GBK"))); //将json数据写入流中
      os.flush();

      //方案一
      response.setCharacterEncoding("UTF-8"); //设置编码格式
      response.setContentType("text/html");  //设置数据格式
      PrintWriter out = response.getWriter(); //获取写入对象
      out.print(json); //将json数据写入流中
      out.flush();
    }
    catch(Exception e)
    {
      e.printStackTrace();
    }

    //return "home";
  }
}

@RequestMapping(value="/Home/writeJson", method=RequestMethod.GET, produces = "text/html;charset=UTF-8")
@ResponseBody
public Object writeJson(HttpServletResponse response)
{
    ObjectMapper mapper = new ObjectMapper();

    HashMap<String,String> map = new HashMap<String,String>();
    map.put("1","张三");
    map.put("2","李四");
    map.put("3","王五");
    map.put("4", "Jackson");

    String json = "";

    try
    {
      json = mapper.writeValueAsString(map);
      System.out.println(json);
    }
    catch(Exception e)
    {
      e.printStackTrace();
    }

    return json;
}