Java Http协议服务器demo
浏览数：152 /
时间：2015年06月08日
import java.io.*;
import java.net.*;
/**
* MyHttpServer 实现一个简单的HTTP服务器端，可以获取用户提交的内容
* 并给用户一个response
* 因为时间的关系，对http头的处理显得不规范
* **/
public class MyHttpServer {
//服务器根目录，post.html, upload.html都放在该位置
public static String WEB_ROOT = "c:/root";
//端口
private int port;
//用户请求的文件的url
private String requestPath;
//mltipart/form-data方式提交post的分隔符,
private String boundary = null;
//post提交请求的正文的长度
private int contentLength = 0;
public MyHttpServer(String root, int port) {
WEB_ROOT = root;
this.port = port;
requestPath = null;
}
//处理GET请求
private void doGet(DataInputStream reader, OutputStream out) throws Exception {
if (new File(WEB_ROOT + this.requestPath).exists()) {
//从服务器根目录下找到用户请求的文件并发送回浏览器
InputStream fileIn = new FileInputStream(WEB_ROOT + this.requestPath);
byte[] buf = new byte[fileIn.available()];
fileIn.read(buf);
out.write(buf);
out.close();
fileIn.close();
reader.close();
System.out.println("request complete.");
}
}
//处理post请求
private void doPost(DataInputStream reader, OutputStream out) throws Exception {
String line = reader.readLine();
while (line != null) {
System.out.println(line);
line = reader.readLine();
if ("".equals(line)) {
break;
} else if (line.indexOf("Content-Length") != -1) {
this.contentLength = Integer.parseInt(line.substring(line.indexOf("Content-Length") + 16));
}
//表明要上传附件， 跳转到doMultiPart方法。
else if(line.indexOf("multipart/form-data")!= -1){
//得multiltipart的分隔符
this.boundary = line.substring(line.indexOf("boundary") + 9);
this.doMultiPart(reader, out);
return;
}
}
//继续读取普通post（没有附件）提交的数据
System.out.println("begin reading posted data......");
String dataLine = null;
//用户发送的post数据正文
byte[] buf = {};
int size = 0;
if (this.contentLength != 0) {
buf = new byte[this.contentLength];
while(size<this.contentLength){
int c = reader.read();
buf[size++] = (byte)c;
}
System.out.println("The data user posted: " + new String(buf, 0, size));
}
//发送回浏览器的内容
String response = "";
response += "HTTP/1.1 200 OK/n";
response += "Server: Sunpache 1.0/n";
response += "Content-Type: text/html/n";
response += "Last-Modified: Mon, 11 Jan 1998 13:23:42 GMT/n";
response += "Accept-ranges: bytes";
response += "/n";
String body = "<html><head><title>test server</title></head><body><p>post ok:</p>" + new String(buf, 0, size) + "</body></html>";
System.out.println(body);
out.write(response.getBytes());
out.write(body.getBytes());
out.flush();
reader.close();
out.close();
System.out.println("request complete.");
}
//处理附件
private void doMultiPart(DataInputStream reader, OutputStream out) throws Exception {
System.out.println("doMultiPart ......");
String line = reader.readLine();
while (line != null) {
System.out.println(line);
line = reader.readLine();
if ("".equals(line)) {
break;
} else if (line.indexOf("Content-Length") != -1) {
this.contentLength = Integer.parseInt(line.substring(line.indexOf("Content-Length") + 16));
System.out.println("contentLength: " + this.contentLength);
} else if (line.indexOf("boundary") != -1) {
//获取multipart分隔符
this.boundary = line.substring(line.indexOf("boundary") + 9);
}
}
System.out.println("begin get data......");
/*下面的注释是一个浏览器发送带附件的请求的全文，所有中文都是说明性的文字*****
<HTTP头部内容略>
............
Cache-Control: no-cache
<这里有一个空行，表明接下来的内容都是要提交的正文>
-----------------------------7d925134501f6<这是multipart分隔符>
Content-Disposition: form-data; name="myfile"; filename="mywork.doc"
Content-Type: text/plain
<附件正文>........................................
.................................................
-----------------------------7d925134501f6<这是multipart分隔符>
Content-Disposition: form-data; name="myname"<其他字段或附件>
<这里有一个空行>
<其他字段或附件的内容>
-----------------------------7d925134501f6--<这是multipart分隔符，最后一个分隔符多两个->
****************************************************************/
/**
* 上面的注释是一个带附件的multipart类型的POST的全文模型，
* 要把附件去出来，就是要找到附件正文的起始位置和结束位置
* **/
if (this.contentLength != 0) {
//把所有的提交的正文，包括附件和其他字段都先读到buf.
byte[] buf = new byte[this.contentLength];
int totalRead = 0;
int size = 0;
while (totalRead < this.contentLength) {
size = reader.read(buf, totalRead, this.contentLength - totalRead);
totalRead += size;
}
//用buf构造一个字符串，可以用字符串方便的计算出附件所在的位置
String dataString = new String(buf, 0, totalRead);
System.out.println("the data user posted:/n" + dataString);
int pos = dataString.indexOf(boundary);
//以下略过4行就是第一个附件的位置
pos = dataString.indexOf("/n", pos) + 1;
pos = dataString.indexOf("/n", pos) + 1;
pos = dataString.indexOf("/n", pos) + 1;
pos = dataString.indexOf("/n", pos) + 1;
//附件开始位置
int start = dataString.substring(0, pos).getBytes().length;
pos = dataString.indexOf(boundary, pos) - 4;
//附件结束位置
int end = dataString.substring(0, pos).getBytes().length;
//以下找出filename
int fileNameBegin = dataString.indexOf("filename") + 10;
int fileNameEnd = dataString.indexOf("/n", fileNameBegin);
String fileName = dataString.substring(fileNameBegin, fileNameEnd);
/**
* 有时候上传的文件显示完整的文件名路径,比如c:/my file/somedir/project.doc
* 但有时候只显示文件的名字，比如myphoto.jpg.
* 所以需要做一个判断。
*/
if(fileName.lastIndexOf("//")!=-1){
fileName = fileName.substring(fileName.lastIndexOf("//") + 1);
}
fileName = fileName.substring(0, fileName.length()-2);
OutputStream fileOut = new FileOutputStream("c://" + fileName);
fileOut.write(buf, start, end-start);
fileOut.close();
fileOut.close();
}
String response = "";
response += "HTTP/1.1 200 OK/n";
response += "Server: Sunpache 1.0/n";
response += "Content-Type: text/html/n";
response += "Last-Modified: Mon, 11 Jan 1998 13:23:42 GMT/n";
response += "Accept-ranges: bytes";
response += "/n";
out.write("<html><head><title>test server</title></head><body><p>Post is ok</p></body></html>".getBytes());
out.flush();
reader.close();
System.out.println("request complete.");
}
public void service() throws Exception {
ServerSocket serverSocket = new ServerSocket(this.port);
System.out.println("server is ok.");
//开启serverSocket等待用户请求到来，然后根据请求的类别作处理
//在这里我只针对GET和POST作了处理
//其中POST具有解析单个附件的能力
while (true) {
Socket socket = serverSocket.accept();
System.out.println(socket.getInetAddress());
System.out.println("new request coming.");
DataInputStream reader = new DataInputStream((socket.getInputStream()));
String line = reader.readLine();
String method = line.substring(0, 4).trim();
OutputStream out = socket.getOutputStream();
this.requestPath = line.split(" ")[1];
System.out.println(method);
if ("GET".equalsIgnoreCase(method)) {
System.out.println("do get......");
this.doGet(reader, out);
} else if ("POST".equalsIgnoreCase(method)) {
System.out.println("do post......");
this.doPost(reader, out);
}
socket.close();
System.out.println("socket closed.");
}
}
public static void main(String args[]) throws Exception {
MyHttpServer server = new MyHttpServer("c:/root", 8080);
server.service();
}
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