后端 java eclipse

字节流转字符

package Httpv3;
import com.sun.net.httpserver.Headers;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
//来源
//http://blog.csdn.net/xietansheng/article/details/78704783
//浏览器访问: http://localhost:8080/、http://localhost:8080/bb，输出: Hello World
//浏览器访问: http://localhost:8080/aa、http://localhost:8080/aa/bb，输出: Hello World AA
//                            版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
//原文链接：http://blog.csdn.net/xietansheng/article/details/78704783
public class Mainv2 {
public String mydata=new String();
public static void main(String[] args) throws Exception {
String mydatav2= new String();
// 创建 http 服务器, 绑定本地 8080 端口
HttpServer httpServer = HttpServer.create(new InetSocketAddress(8080), 0);
// 创上下文监听, "/" 表示匹配所有 URI 请求
httpServer.createContext("/", new HttpHandler() {
@Override
public void handle(HttpExchange httpExchange) throws IOException {
System.out.println("addr: " + httpExchange.getRemoteAddress() +     // 客户端IP地址
"; protocol: " + httpExchange.getProtocol() +               // 请求协议: HTTP/1.1
"; method: " + httpExchange.getRequestMethod() +            // 请求方法: GET, POST 等
"; URI: " + httpExchange.getRequestURI());                  // 请求 URI
// 获取请求头
String userAgent = httpExchange.getRequestHeaders().getFirst("User-Agent");
System.out.println("User-Agent: " + userAgent);
// 响应内容
//                byte[] respContents = "Hello World".getBytes("UTF-8");
byte[] respContents = ("\r
"
+ "\r
"
+ "  Tove\r
"
+ "  Jani\r
"
+ "  Reminder\r
"
+ "  Don't forget me this weekend!\r
"
+ "").getBytes("UTF-8");
// 设置响应头
//                httpExchange.getResponseHeaders().add("Content-Type", "text/html; charset=UTF-8");
//               参数解释-允许跨域的各个参数
//              http://developer.mozilla.org/zh-CN/docs/Web/HTTP/Headers/Access-Control-Request-Headers
httpExchange.getResponseHeaders().add("Access-Control-Allow-Origin","*");
httpExchange.getResponseHeaders().add("Access-Control-Allow-Headers","*");
httpExchange.getResponseHeaders().add("Access-Control-Allow-Methods","*");
//              允许接收各种消息头 对应前端 xhr.setRequestHeader('Content-Type', 'application/json');
httpExchange.getResponseHeaders().add("Access-Control-Request-Headers","*");
httpExchange.getResponseHeaders().add("Access-Control-Expose-Headers","*" );
//              对应前端特定消息头 xhr.setRequestHeader('Content-Type', 'application/json');
httpExchange.getResponseHeaders().add("Content-Type", "text/html; charset=UTF-8");
// 设置响应code和内容长度
httpExchange.sendResponseHeaders(200, respContents.length);
// 设置响应内容
httpExchange.getResponseBody().write(respContents);
//                测试数据
//                String receive = httpExchange.getResponseBody().toString();
//                System.out.println(receive);
//                
//                String receivev2 = httpExchange.getRequestBody().toString();
//                System.out.println(receivev2);
//                获取数组，把其他的body打印出来，发现是asc码
byte[] receivev3 = httpExchange.getRequestBody().readAllBytes();
System.out.println(Arrays.toString(receivev3));
//                字节流转字符流
String utf_8 = new String(receivev3,StandardCharsets.UTF_8);
System.out.println(utf_8);
//                String have = Arrays.toString(receivev3);
//                System.out.println(have.toString());
//                System.out.println(have);
//                System.out.println(have.length());
//                for(int i=0;i<have.length();i++) {
//                	System.out.println((char)receivev3[i]);
//                }
//                char[] message = new char[1000];
//                 String str = new String();
//                 String s=new String();
//                for(int i=0;i<have.length()-2;i++) {
//                	message[i]=(char)receivev3[i];
//                	System.out.println(message[i]);
//                	字符变字符串
//                	s=Character.toString(message[i]);
//                	System.out.println(s);
//                	字符串追加到 str
//                	str=str.concat(s);
//                	System.out.println(str);
//                	System.out.println(str.length());
//                }
//                mydatav2.copyValueOf(message);
//                
//                System.out.println("revieve"+str);
//                System.out.println(str);
//                System.out.println(have.length());
//                
//                System.out.println("mydatav2"+mydatav2);
//                System.out.println(str.length());
//                System.out.println(Arrays.toString(receivev3));
//                InputStream have = httpExchange.getRequestBody();
//                byte[] posting = have.readAllBytes();
//                System.out.println(Arrays.toString(posting));
// 关闭处理器
httpExchange.close();
//              来源
//              http://vimsky.com/examples/detail/java-method-com.sun.net.httpserver.HttpExchange.getResponseHeaders.html
//                Headers responseHeaders = httpExchange.getResponseHeaders();
//        	    responseHeaders.add("Access-Control-Allow-Origin", "*");
//        	    responseHeaders.add("Access-Control-Allow-Headers", "*");
//        	    X-Custom-Header
//              httpExchange.getResponseHeaders().add("Content-Type", "text/html; charset=UTF-8");
//        	    httpExchange.getResponseHeaders().add("Access-Control-Allow-Methods","*");
//        	    httpExchange.sendResponseHeaders(200, respContents.length);
//        	    OutputStream outputStream = httpExchange.getResponseBody();
//        	    outputStream.write(httpExchange.getResponseCode());
//        	    outputStream.close();
//        	    byte[] respContentsv3 = "Hello World".getBytes("UTF-8");
//        	    httpExchange.sendResponseHeaders(200, respContentsv3.length);
//        	    httpExchange.getResponseBody().write(respContentsv3);
//        	    System.out.println("message"+httpExchange.getRequestBody().toString());
//        	    httpExchange.close();
}
});
// 创建上下文监听, 处理 URI 以 "/aa" 开头的请求
httpServer.createContext("/aa", new HttpHandler() {
@Override
public void handle(HttpExchange httpExchange) throws IOException {
byte[] respContents = "Hello World AA".getBytes("UTF-8");
httpExchange.getResponseHeaders().add("Content-Type", "text/html; charset=UTF-8");
httpExchange.sendResponseHeaders(200, respContents.length);
httpExchange.getResponseBody().write(respContents);
httpExchange.close();
//                来源
//                http://vimsky.com/examples/detail/java-method-com.sun.net.httpserver.HttpExchange.getResponseHeaders.html
// Add the header to avoid error:
// “No 'Access-Control-Allow-Origin' header is present on the requested resource”
//                
//                Headers responseHeaders = httpExchange.getResponseHeaders();
//        	    responseHeaders.add("Access-Control-Allow-Origin", "*");
//        	    httpExchange.sendResponseHeaders(200, respContents.length);
//
//        	    OutputStream outputStream = httpExchange.getResponseBody();
//        	    outputStream.write(httpExchange.getResponseCode());
//        	    outputStream.close();
//        	    
}
});
// 启动服务
httpServer.start();
}
}

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