map转json字符串 java（map转json字符串的方法）

科技前沿 • 2025-04-23 15:10 • 阅读 51

大家好，我是讯享网，很高兴认识大家。

 <pre><span style="color:#ff9900;">import </span>com.fasterxml.jackson.core.JsonProcessingException;

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import com.fasterxml.jackson.core.type.TypeReference; import com.fasterxml.jackson.databind.ObjectMapper;

import java.util.HashMap; import java.util.Map;

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public class JsonMapTransformationTest {

讯享网public static void <span style="color:#1a439c;">main</span>(String[] args) <span style="color:#ff9900;">throws </span>JsonProcessingException { HashMap&lt;String,String&gt; map&#61;<span style="color:#ff9900;">new </span>HashMap&lt;&gt;(); map.put(&#34;userId&#34;,&#34;zhangSan,lisi,wangWu&#34;); map.put(&#34;deptId&#34;,&#34;1201,2705,3001&#34;); map.put(&#34;requirement&#34;,&#34;do Good&#34;); ObjectMapper objectMapper &#61; <span style="color:#ff9900;">new </span>ObjectMapper(); String jsonString &#61; objectMapper.writeValueAsString(map); System.<span style="color:#ed7976;">out</span>.println(&#34;map2jsonString&#61;&#34;&#43;jsonString); Map&lt;String, Object&gt; map2 &#61; objectMapper.readValue(jsonString, <span style="color:#ff9900;">new </span><span style="color:#1a439c;">TypeReference</span>&lt;Map&lt;String, Object&gt;&gt;(){}); System.<span style="color:#ed7976;">out</span>.println(&#34;

jsonString2map,userId=“+map2.get(”userId“));

 System.<span style="color:#ed7976;">out</span>.println(&#34;jsonString2map,deptId&#61;&#34;&#43;map2.get(&#34;deptId&#34;)); System.<span style="color:#ed7976;">out</span>.println(&#34;jsonString2map,requirement&#61;&#34;&#43;map2.get(&#34;requirement&#34;)); / <span style="color:#1c7331;"><strong> 执行结果</strong></span>

map2jsonString={”deptId“:”1201,2705,3001“,”requirement“:”do Good“,”userId“:”zhangSan,lisi,wangWu“}

讯享网 jsonString2map,userId&#61;zhangSan,lisi,wangWu jsonString2map,deptId&#61;1201,2705,3001 jsonString2map,requirement&#61;do Good

}

map转json字符串 java（map转json字符串的方法）

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