代碼倉庫:https://gitee.com/DerekAndroid/ServletResponse.git
ServletContext
package com.itheima.a_servletContextApi;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ServletContextApi extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//獲取ServletContext對象
ServletContext sc = getServletContext();
//獲取全局初始化參數
String db = sc.getInitParameter("db");
System.out.println(db);
//獲取所有全局初始化參數名稱
Enumeration<String> initParameterNames = sc.getInitParameterNames();
while (initParameterNames.hasMoreElements()) {
String string = (String) initParameterNames.nextElement();
System.out.println(string+":"+sc.getInitParameter(string));
}
//獲取一個資源在服務器上的真實路徑
String realPath = sc.getRealPath("/1.html");
System.out.println(realPath);
//以流的形式返回一個文件
InputStream is = sc.getResourceAsStream("/1.html");
System.out.println(is);
//獲取一個文件的mime類型(大類型/小類型 image/gif)
String mimeType = sc.getMimeType("/1.jpg");
System.out.println(mimeType);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
response
package com.itheima.d_out;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class OutServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//字符流和字節流不能同時出現 倆流互斥
/*ServletOutputStream outputStream = response.getOutputStream();*/
//解決響應亂碼第一種方式
//response.setHeader("content-type", "text/html;charset=utf-8");
//解決響應亂碼第二種方式
response.setContentType("text/html;charset=utf-8");
response.getWriter().print("<table border=1px>");
response.getWriter().print("<tr>");
response.getWriter().print("<td>");
response.getWriter().print("湯姆貓");
response.getWriter().print("</td>");
response.getWriter().print("<td>");
response.getWriter().print("123");
response.getWriter().print("</td>");
response.getWriter().print("</tr>");
response.getWriter().print("</table>");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}