根据post请求调取app接口，map对象转字符串，json对象转字符串

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@RequestMapping("/user_systemallot_insert.do")

@ResponseBody

public Map&lt;String, Object&gt; systemallotInsert(HttpServletRequest request,HttpSession session){

Map&lt;String, Object&gt; map = new HashMap&lt;&gt;();

HashMap&lt;String, Object&gt; rlt = new HashMap&lt;&gt;();

HashMap&lt;String, String&gt; params = new HashMap&lt;&gt;();

try {

Object identityCode =  session.getAttribute("identity_code");

if(identityCode==null||"".equals(identityCode)){

map.put("status", 2);

map.put("message", "未登录");

return map;

}

rlt.put("product_coding", request.getParameter("productCodes"));

rlt.put("view", request.getParameter("view"));

rlt.put("edit", request.getParameter("edit"));

params.put("identity_code",identityCode.toString());

params.put("mobile", request.getParameter("mobile"));

params.put("truename", request.getParameter("truename"));

params.put("gid", request.getParameter("gid"));

params.put("password", request.getParameter("secondpwd"));

params.put("auth", ConvertMap2Json.buildJsonBody(rlt, 0, true));

String json =         HttpClientUtil.httpPost("http://test.shangke.com/app/user/register/", params, "utf-8");

ObjectMapper mapper = new ObjectMapper();

JsonNode node = mapper.readTree(json);

if(1==node.findValue("status").intValue()){

map.put("status", 1);

map.put("message", "提交成功");

}else{

map.put("status", 0);

map.put("message", node.findValue("message").asText());

} catch (Exception e) {

e.printStackTrace();

map.put("message", "系统异常");

ConvertMap2Json.java类

&lt;!---------------------------------------------开始--------------------------------------&gt;

package com.shangyukeji.icoolcloud.util;

import java.text.SimpleDateFormat;

import java.util.Map;

import java.util.Set;

public class ConvertMap2Json {

private static final String QUOTE = "\"";  

    /** 

     * 将Map转成一个json对象,即像大括号的东西 

     * e.g. 

     * { 

     *      "eventName": "name" 

     * } 

     * 

     * @param body 

     * @param tabCount 

     * @param addComma 

     * @return 

     */  

    public static String buildJsonBody(Map&lt;String, Object&gt; body, int tabCount, boolean addComma)  

    {  

        StringBuilder sbJsonBody = new StringBuilder();  

        sbJsonBody.append("{\n");  

        Set&lt;String&gt; keySet = body.keySet();  

        int count = 0;  

        int size = keySet.size();  

        for (String key : keySet)  

        {  

            count++;  

            sbJsonBody.append(buildJsonField(key, body.get(key), tabCount + 1, count != size));  

        }  

        sbJsonBody.append(getTab(tabCount));  

        sbJsonBody.append("}");  

        return sbJsonBody.toString();  

    }  

     * 生成一个json字段即像这样的 

     * "eventName": "aaa" 

     * @param key 

     * @param value 

    private static String buildJsonField(String key, Object value, int tabCount, boolean addComma)  

        StringBuilder sbJsonField = new StringBuilder();  

        sbJsonField.append(getTab(tabCount));  

        sbJsonField.append(QUOTE).append(key).append(QUOTE).append(": ");  

        sbJsonField.append(buildJsonValue(value, tabCount, addComma));  

        return sbJsonField.toString();  

     * 生成json值对象 

     * "string" 

     * 或 

     *      "key": "value" 

    private static String buildJsonValue(Object value, int tabCount, boolean addComma)  

        StringBuilder sbJsonValue = new StringBuilder();  

        if (value instanceof String)  

            sbJsonValue.append(QUOTE).append(value).append(QUOTE);  

        else if (value instanceof Integer || value instanceof Long || value instanceof Double)  

            sbJsonValue.append(value);  

        else if (value instanceof java.util.Date)  

            sbJsonValue.append(QUOTE).append(formatDate((java.util.Date) value)).append(QUOTE);  

        else if (value.getClass().isArray() || value instanceof java.util.Collection)  

            sbJsonValue.append(buildJsonArray(value, tabCount, addComma));  

        else if (value instanceof java.util.Map)  

            sbJsonValue.append(buildJsonBody((java.util.Map) value, tabCount, addComma));  

        sbJsonValue.append(buildJsonTail(addComma));  

        return sbJsonValue.toString();  

     * 生成json数组对象 

     * [ 

     *      "value" 

     * ] 

     *      { 

     *          "key": "value" 

     *      } 

    private static String buildJsonArray(Object value, int tabCount, boolean addComma)  

        StringBuilder sbJsonArray = new StringBuilder();  

        sbJsonArray.append("[\n");  

        Object[] objArray = null;  

        if (value.getClass().isArray())  

            objArray = (Object[]) value;  

        else if (value instanceof java.util.Collection)//将集合类改为对象数组  

            objArray = ((java.util.Collection) value).toArray();  

        int size = objArray.length;  

        //循环数组里的每一个对象  

        for (Object obj : objArray)  

            //加上缩进，比上一行要多一个缩进  

            sbJsonArray.append(getTab(tabCount + 1));  

            //加上对象值，比如一个字符串"String"，或者一个对象  

            sbJsonArray.append(buildJsonValue(obj, tabCount + 1, ++count != size));  

        sbJsonArray.append(getTab(tabCount));  

        sbJsonArray.append("]");  

        return sbJsonArray.toString();  

     * 加上缩进，即几个\t 

     * TODO. 

     * @param count 

    private static String getTab(int count)  

        StringBuilder sbTab = new StringBuilder();  

        while (count-- &gt; 0)  

            sbTab.append("\t");  

        return sbTab.toString();  

     * 加上逗号 

    private static String buildJsonTail(boolean addComma)  

        return addComma ? ",\n" : "\n";  

     * 格式化日期 

     * @param date 

    private static String formatDate(java.util.Date date)  

        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date);  

&lt;!----------------------------------结束-----------------------------------------&gt;

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本文转自 沉淀人生 51CTO博客，原文链接:http://blog.51cto.com/825272560/1891448