java解析json字符串总结

1:第一种处理方法https://github.com/ralfstx/minimal-json
首先maven引入
        <dependency>
            <groupId>com.eclipsesource.minimal-json</groupId>
            <artifactId>minimal-json</artifactId>
            <version>0.9.4</version>
        </dependency>
定义jsob
        String sss = "{\"items\":[{\"xm\":\"张三\",\"bz\":\"学生\",\"nl\":\"18\"}]}";
        JsonArray item = Json.parse(sss).asObject().get("items").asArray();
       System.out.println("==value==="+item);
      for (JsonValue i : item) {
                String value = i.asObject().getString("xm", "");
                System.out.println("==value==="+value);//取出来就是"张三"
           
            }
2:第二种方法:

       try{
            JsonNode jsonNode = JsonUtils.jsonToJsonNode(sss).get("items");
                System.out.println("=====value====="+jsonNode.get(0).get("xm").asText());//取出来就是"张三"

        }catch (IOException e){
            e.printStackTrace();
        }
JsonUtils如下:
public class JsonUtils {

    /**
     * 将字符串转成JsonNode，允许斜杠等字符串
     */
    public static JsonNode jsonToJsonNode(String json) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        // 允许反斜杆等字符
        mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS,true);
        //允许单引号
        mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES,true);
        return mapper.readValue(json, JsonNode.class);
    }

    public static <T> String objectToJson(Object object, Class<T> cls)throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        mapper.registerSubtypes(cls);
        String reqJson = mapper.writeValueAsString(object);
        return reqJson;
    }

    /**
     * 将字符串转成实体类，允许斜杠等字符串
     */
    public static <T> T jsonToEntity(String json, Class<T> clazz) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        // 允许反斜杆等字符
        mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS,true);
        return mapper.readValue(json, clazz);
    }
}