使用Http Server构建web应用
2019-06-17 本文已影响0人
奋斗live
一、输出信息到页面中
package http;
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.OutputStream;
import java.net.InetSocketAddress;
public class Http {
public static void main(String[] arg) throws Exception{
HttpServer server = HttpServer.create(new InetSocketAddress(8001),0);
server.createContext("/index",new TestHandler());
server.start();
}
static class TestHandler implements HttpHandler{
@Override
public void handle(HttpExchange exchange) throws IOException {
String response = "this is server";
exchange.sendResponseHeaders(200, 0);
OutputStream os = exchange.getResponseBody();
os.write(response.getBytes());
os.close();
}
}
}
直接在浏览器上输入地址访问
http://127.0.0.1:8001/index
显示如下图
image.png
二、加载某个页面
加载某个页面，需要用到pom.xml
项目结构如下
image.png
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>netty_tcp_test</groupId>
<artifactId>netty_tcp_test</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<netty.version>4.1.25.Final</netty.version>
<os.detected.classifier>linux-x86_64</os.detected.classifier>
<slf4j.version>1.7.25</slf4j.version>
<java.version>1.8</java.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
<encoding>${java.version}</encoding>
</configuration>
</plugin>
</plugins>
</build>
</project>
Http.java
package http;
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;
public class Http {
public static void main(String[] arg) throws Exception{
HttpServer server = HttpServer.create(new InetSocketAddress(8002),0);
server.createContext("/index.html",new TestHandler());
server.start();
System.out.println("启动成功");
}
static class TestHandler implements HttpHandler{
private byte[] data;
public TestHandler(){
try(InputStream in = this.getClass().getResourceAsStream("/index.html")){
this.data = new byte[in.available()];
in.read(data);
}catch (Exception e){
throw new RuntimeException(e);
}
}
@Override
public void handle(HttpExchange exchange) throws IOException {
String response = "this is server";
exchange.getResponseHeaders().set("Content-Type", "text/html");
exchange.sendResponseHeaders(200, 0);
OutputStream os = exchange.getResponseBody();
os.write(data);
os.close();
}
}
}
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>teste</title>
</head>
<body>
<form onsubmit="return false;">
<label>
name
<input type="text" value="yilian" id="userId" required="required" style="width: 100%">
</label>
<br/>
<label>
age<span style="color: red">*</span>
<input type="text" value="age" id="hello" required="required" style="width: 100%">
</label>
<br/>
<label>
sex
<input type="checkbox" value="sex" id="broadcast">
</label>
<br/>
<br/>
<input type="button" value="Send To Client" style="width: 100%" onclick="send()">
</form>
<script type="application/javascript">
function $(id) {
return document.getElementById(id);
}
function send() {
var broadcast = $('broadcast').checked;
var userId = $('userId').value;
var content = $('hello').value;
if (!userId && !broadcast) {
alert("please input userId.");
return false;
}
if (!content) {
alert("please input content.");
return false;
}
var xhr = new XMLHttpRequest();
xhr.open('POST', '/push', true);
xhr.setRequestHeader("context-type", "application/json; charset=utf-8");
xhr.onload = function (e) {
if (this.status == 200) {
alert(this.response)
}
};
xhr.send(JSON.stringify({
userId: userId,
hello: content,
broadcast: broadcast,
condition: $('condition').value
}));
}
</script>
</body>
</html>
启动后如下访问，即可访问到对应的index.html页面
image.png
3、并发处理
对于TestHandler，可以在其中为每个新的请求新开一个线程进行处理，如下
static class TestHandler implements HttpHandler{
private byte[] data;
public TestHandler(){
try(InputStream in = this.getClass().getResourceAsStream("/index.html")){
this.data = new byte[in.available()];
in.read(data);
}catch (Exception e){
throw new RuntimeException(e);
}
}
@Override
public void handle(HttpExchange exchange) throws IOException {
new Thread(new Runnable() {
@Override
public void run() {
try {
exchange.getResponseHeaders().set("Content-Type", "text/html");
exchange.sendResponseHeaders(200, 0);
OutputStream os = exchange.getResponseBody();
os.write(data);
os.close();
}catch (IOException ie){
ie.printStackTrace();
}catch (Exception e){
e.printStackTrace();
}
}
}).start();
}
}
