//获取请求头和请求数据
//请求数据（1.通过超链接 2.通过表单）
//获取请求数据的时候一般来说 都要先检查 再使用
public class RequestDemo2 extends HttpServlet {
//获取数据的相关方法
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("-----------获取数据方式1-------------");
String value = request.getParameter("username");
if(value != null && !value.trim().equals("")) {
System.out.println(value);
}
System.out.println("-----------获取数据方式2----------- -");
Enumeration e = request.getParameterNames();
while(e.hasMoreElements()) {
String name = (String) e.nextElement();
value = request.getParameter(name);
System.out.println(name + "=" + value);
}
System.out.println("-----------获取数据方式3-------------");
String[] values = request.getParameterValues("username");
for(int i = 0;i<values.length && values[i] != null;i++) {
System.out.println(values[i]);
}
System.out.println("-----------获取数据方式4-------------");
/*使用Map （常用）*/
/*Map<String,String[]> map = request.getParameterMap();
User user = new User();
try {
BeanUtils.populate(user, map); //用map集合的数据填充bean
BeanUtils.copyProperties(user, formbean);
} catch(Exception e1) {
e1.printStackTrace();
}*/
System.out.println("-----------获取数据方式5-------------"); //用于文件上传
InputStream in = request.getInputStream();
int len = 0;
byte[] buffer = new byte[1024];
while((len = in.read()) > 0) {
System.out.print(new String(buffer,0,len));
}
}
//获取头的相关方法
private void test1(HttpServletRequest request) {
String HeadValue = request.getHeader("Accept-Encoding");
System.out.println(HeadValue);
System.out.println("-------------------------");
Enumeration e = request.getHeaders("Accept-Encoding");
while(e.hasMoreElements()) {
String value = (String) e.nextElement();
System.out.println(value);
}
System.out.println("-------------------------");
e = request.getHeaderNames();
while(e.hasMoreElements()) {
String name = (String) e.nextElement();
String value = request.getHeader(name);
System.out.println(name + "=" + value);
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
//获取请求头和请求数据
//请求数据（1.通过超链接 2.通过表单）
//获取请求数据的时候一般来说 都要先检查 再使用
public class RequestDemo2 extends HttpServlet {
//获取数据的相关方法
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("-----------获取数据方式1-------------");
String value = request.getParameter("username");
if(value != null && !value.trim().equals("")) {
System.out.println(value);
}
System.out.println("-----------获取数据方式2----------- -");
Enumeration e = request.getParameterNames();
while(e.hasMoreElements()) {
String name = (String) e.nextElement();
value = request.getParameter(name);
System.out.println(name + "=" + value);
}
System.out.println("-----------获取数据方式3-------------");
String[] values = request.getParameterValues("username");
for(int i = 0;i<values.length && values[i] != null;i++) {
System.out.println(values[i]);
}
System.out.println("-----------获取数据方式4-------------");
/*使用Map （常用）*/
/*Map<String,String[]> map = request.getParameterMap();
User user = new User();
try {
BeanUtils.populate(user, map); //用map集合的数据填充bean
BeanUtils.copyProperties(user, formbean);
} catch(Exception e1) {
e1.printStackTrace();
}*/
System.out.println("-----------获取数据方式5-------------"); //用于文件上传
InputStream in = request.getInputStream();
int len = 0;
byte[] buffer = new byte[1024];
while((len = in.read()) > 0) {
System.out.print(new String(buffer,0,len));
}
}
//获取头的相关方法
private void test1(HttpServletRequest request) {
String HeadValue = request.getHeader("Accept-Encoding");
System.out.println(HeadValue);
System.out.println("-------------------------");
Enumeration e = request.getHeaders("Accept-Encoding");
while(e.hasMoreElements()) {
String value = (String) e.nextElement();
System.out.println(value);
}
System.out.println("-------------------------");
e = request.getHeaderNames();
while(e.hasMoreElements()) {
String name = (String) e.nextElement();
String value = request.getHeader(name);
System.out.println(name + "=" + value);
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
5.1 Request 获取请求数据的几种方法的相关教程结束。
