java 获取request中json数据

功能简介：

        Java 从 httpservletRequest 中获取前端传输过来的JSON数据

效果展示：

请求示例：

post: 127.0.0.1:8081/getRequestjson

{"messageHistory",[{"message":"123","time":"2023-03-22 10:00:00"}],"isContextChat":true}

代码示例：

@RequestMapping(value = "getRequestJson", method = RequestMethod.POST)@ResponseBodypublic String getRequestJson(HttpServletRequest request) throws IOException {    StringBuilder buffer = new StringBuilder();    BufferedReader reader = request.getReader();    String line;    while ((line = reader.readLine()) != null) {        buffer.append(line);    }    String requestBody = buffer.toString();    System.out.println("--------> get request json is :" + requestBody);return requestBody;}

拓展：

import com.fasterxml.jackson.databind.Jsonnode;import com.fasterxml.jackson.databind.ObjectMapper;@RequestMapping(value = "getRequestJson", method = RequestMethod.POST)@ResponseBodypublic String getRequestJson(HttpServletRequest request) throws ioException {// 1. 从HttpServletRequest对象中获取输入流，并读取请求正文。StringBuilder buffer = new StringBuilder();BufferedReader reader = request.getReader();String line;while ((line = reader.readLine()) != null) {buffer.append(line);}String requestBody = buffer.toString();// 2. 使用JSON库（如Jackson、Gson等）将字符串解析为JsonNode或任何其他适合你的数据结构。ObjectMapper mapper = new ObjectMapper(); // Jackson JSON库示例JsonNode jsonNode = mapper.readTree(requestBody); // 解析为JsonNode对象// 3. 现在，你可以使用jsonNode对象来访问和操作JSON数据了。String name = jsonNode.get("name").asText();int age = jsonNode.get("age").asInt();// 遍历所有属性并打印它们的值：Iterator fieldNamesIter= jsonNode.fieldNames();while (fieldNamesIter.hasNext()){String fieldName=fieldNamesIter.next();JsonNode fieldValue=jsonNode.get(fieldName);System.out.println(fieldName+": "+fieldValue.asText());}System.out.println("--------> get request json is :" + requestBody);return requestBody;}

来源地址：https://blog.csdn.net/qq_36521848/article/details/129724974