HashMap转换成Json格式

来源：互联网发布：java找不到主类编辑：程序博客网时间：2024/06/05 14:56

http://tongjianhang-sina-cn.iteye.com/blog/1254096

Java代码：

import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map.Entry;

import javax.servlet.http.HttpServletResponse;
/**
* 把Hshmap转换成json，拼装后以html格式输出
*
*/
public class HashmapToJson {
    /**把数据源HashMap转换成json
     * @param map
     */
    public static String hashMapToJson(HashMap map) {
        String string = "{";
        for (Iterator it = map.entrySet().iterator(); it.hasNext();) {
            Entry e = (Entry) it.next();
            string += "'" + e.getKey() + "':";
            string += "'" + e.getValue() + "',";
        }
        string = string.substring(0, string.lastIndexOf(","));
        string += "}";
        return string;
    }
    /**
     * 输出json到HTML
     * @param response
     * @param jsonString 要输出的字符串
     */
    public void outJson(HttpServletResponse response, String jsonString) {
        response.setContentType("text/html");
        response.setCharacterEncoding("utf-8");
        response.setHeader("Pragma", "no-cache");
        response.setHeader("Cache-Control", "no-cache, must-revalidate");
        response.setHeader("Pragma", "no-cache");
        try {
            response.getWriter().println(jsonString);
            response.getWriter().flush();
            response.getWriter().close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    /**
     * 拼装json，输出
     * @param list
     * @param response
     */
    public static void toJson(List list, HttpServletResponse response) {
        HashmapToJson toJson = new HashmapToJson();
        String jsonString = "[";
        for (int i = 0; i < list.size(); i++) {
            if (i != 0)
                jsonString += ",";
            jsonString += toJson.hashMapToJson((HashMap) list.get(i));
        }
        jsonString += "]";
        toJson.outJson(response, jsonString);
    }
}

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