java 把List集合转换为json

1、servlet List转json

需要jar包，可以到我github下载
commons-beanutils-1.7.0.jar
commons-collections-3.2.jar
commons-httpclient-3.0.1.jar
commons-lang-2.4.jar
commons-logging-1.0.4.jar
ezmorph-1.0.3.jar
json-lib-2.2.3-jdk15.jar

代码：

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONArray;

@WebServlet("/searchMeg")
public class searchMeg extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setCharacterEncoding("UTF-8");
        String name=request.getParameter("name");
        name=new String(name.getBytes("ISO-8859-1"),"UTF-8");
        System.out.println(name);
        List list =new ArrayList();
        list.add(name);
        list.add(name+name);
        list.add(name+name+name);
        list.add(name+name+name+name);      
        // 集合转为json     
        response.getWriter().println(JSONArray.fromObject(list).toString());
        /*System.out.println(JSONArray.fromObject(list));*/
    }

}

2、springMVC List转json

用@ResponseBody注解方法返回类型List，会把List转为json

@RequestMapping(value = "getOldNodes", method = RequestMethod.GET)
public @ResponseBody List getOldNodes(HttpSession session){     
    //转json传给js
    List list=new ArrayList() ;
    list.add(nodes);
    list.add(relations);
    return list;    
}