Java创建的HttpServer返回json数据

Question

问题出现的环境背景及自己尝试过哪些方法

在我实现HttpHandler，重写handle方法中，
若向responseBody写入普通字符串(如:"hello")，浏览器中访问该方法可以得到对应的数据。
但是写入json字符串(如："{"pid":"510229197206267348","pname":"张三"}")，浏览器中访问Status Code: 200 OK，但Status却是failed.

我猜想应该是后台header中设置的数据格式类型，但是设置了headers.set("Content-Type", "application/json; charset=utf-8");也没有效果。

写入"{"pid":"510229197206267348","pname":"张三"}"访问服务方法截图：

写入"hello word"访问服务方法截图：

相关代码

public static void main(String[] arg) throws Exception {
        HttpServer server = HttpServer.create(new InetSocketAddress(8001), 0);    
        server.createContext("/post", new BasicPostHttpHandler());        
        // 使用默认的 excutor
        server.setExecutor(null);
        server.start();
    }

public class BasicPostHttpHandler implements HttpHandler{

    @Override
    public void handle(HttpExchange httpExchange) throws IOException {
        
        InputStream is = httpExchange.getRequestBody();
        
        String requestData = is2string(is);
        System.out.println("request: " + requestData);         
        String response = "{\"pid\":\"510229197206267348\",\"pname\":\"张三\"}";   // 写回这个数据就会failed
       // String response = "hello world";  // 若写回这个数据则没有问题 
        System.out.println("response: " + response);        
        is.close();
              
        Headers headers = httpExchange.getResponseHeaders();        
        headers.set("Content-Type", "application/json; charset=utf-8"); 
        headers.set("Access-Control-Allow-Origin", "*");
        headers.set("Access-Control-Allow-Methods","GET,POST,PUT,DELETE,OPTIONS");
        headers.set("Access-Control-Allow-Headers", "Origin,X-Requested-With,Content-Type,Accept"); 
               
        httpExchange.sendResponseHeaders(200, response.length());       
        OutputStream os = httpExchange.getResponseBody();
        os.write(response.getBytes());
        os.close();       
    }
    
    private String is2string(InputStream is) throws IOException {
        final int bufferSize = 1024;
        final char[] buffer = new char[bufferSize];
        final StringBuilder out = new StringBuilder();
        Reader in = new InputStreamReader(is, "UTF-8");
        
        for (; ; ) {
            int rsz = in.read(buffer, 0, buffer.length);
            if (rsz < 0)
                break;
            out.append(buffer, 0, rsz);
        }
        return out.toString();
    }

}

你期待的结果是什么？实际看到的错误信息又是什么？

Answer 1

中文字节的表示问题，

httpExchange.sendResponseHeaders(200, response.length());  改为
httpExchange.sendResponseHeaders(HttpURLConnection.HTTP_OK, response.getBytes().length);即可

Answer 2

@半个夏天 这里我也稍微有一点研究了，你可以去看看我这个 ---> java解析http,可以解决你的问题

Answer 3

跟json没关系！你的是中文问题！