java 实现http响应
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- public class HttpServer {
-
-
- public static final String WEB_ROOT = System.getProperty("user.dir")+File.separator+"webroot";
-
- public static void main(String[] args) {
- HttpServer server = new HttpServer();
- System.out.println("WEB_ROOT:"+WEB_ROOT);
- server.await();
- }
- public void await(){
- ServerSocket serverSocket = null;
- int port = 8080;
- try {
- serverSocket = new ServerSocket(port,1,InetAddress.getByName("127.0.0.1"));
- System.out.println("等待来自浏览器的连接...");
- while(true){
- try {
- Socket socket = null;
- InputStream input = null;
- OutputStream output = null;
- socket = serverSocket.accept();
- input = socket.getInputStream();
- output = socket.getOutputStream();
-
- Request request = new Request(input);
- request.parse();
-
- Response response = new Response(output);
- response.setRequest(request);
- response.sendStaticResource();
- socket.close();
- } catch (Exception e) {
- e.printStackTrace();
- continue;
- }
- }
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- }
可以看到,浏览器发送过来的请求信息是通过socket.getInputStream();得到,并将其封装到Request中,让Request去处理请求信息。2、请求对象Request
- public class Request {
-
-
- private InputStream input;
-
- private String uri;
- public Request(InputStream inputStream){
- this.input = inputStream;
- }
-
- public InputStream getInput() {
- return input;
- }
- public void setInput(InputStream input) {
- this.input = input;
- }
- public String getUri() {
- return uri;
- }
- public void setUri(String uri) {
- this.uri = uri;
- }
-
-
- public void parse(){
-
- StringBuffer request = new StringBuffer(2048);
- int i = 0;
- byte[] buffer = new byte[2048];
-
- try {
- i = input.read(buffer);
- } catch (IOException e) {
- e.printStackTrace();
- i = -1;
- }
- for(int j = 0;j<i;j++){
- request.append((char)(buffer[j]));
- }
- System.out.println(request.toString());
- uri = parseUri(request.toString());
- }
-
- private String parseUri(String requestString){
-
- int index1 = 0;
- int index2 = 0;
- index1 = requestString.indexOf(' ');
- if(index1!=-1){
- index2 = requestString.indexOf(' ',index1+1);
- if(index2>index1){
- return requestString.substring(index1+1,index2);
- }
- }
- return null;
- }
- }
服务器处理完得到响应数据在socket.getOutputStream();封装到Response3、Response
- public class Response {
-
- private static final int BUFFER_SIZE = 1024;
- Request request;
- OutputStream output;
- public Response(OutputStream output){
- this.output = output;
- }
-
- public void sendStaticResource() throws IOException{
-
- byte[] bytes = new byte[BUFFER_SIZE];
- FileInputStream fis = null;
-
- File file = new File(HttpServer.WEB_ROOT,request.getUri());
- if(file.exists()){
- try {
- fis = new FileInputStream(file);
- int ch = fis.read(bytes,0,BUFFER_SIZE);
- while(ch != -1){
- output.write(bytes,0,ch);
- ch = fis.read(bytes,0,BUFFER_SIZE);
- }
-
- } catch (FileNotFoundException e) {
- e.printStackTrace();
- }catch(IOException e){
- e.printStackTrace();
- }finally{
- if(fis !=null){
- fis.close();
- }
- }
-
- }else{
-
- String errorMessage = "HTTP/1.1 404 File Not Found\r\n" +
- "Content-Type: text/html\r\n" +
- "Content-Length: 23\r\n" +
- "\r\n" +
- "<h1>File Not Found</h1>";
- try {
- output.write(errorMessage.getBytes());
- output.flush();
- } catch (IOException e) {
-
- e.printStackTrace();
- }
- }
- }
- public Request getRequest() {
- return request;
- }
- public void setRequest(Request request) {
- this.request = request;
- }
- public OutputStream getOutput() {
- return output;
- }
- public void setOutput(OutputStream output) {
- this.output = output;
- }
- public static int getBUFFER_SIZE() {
- return BUFFER_SIZE;
- }
- }