String getparamter(String name) :根据参数名获取参数值， username=zs &password=123
@WebServlet("/requestDemo1")
public class requestDemo1 extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String username = req.getParameter("username");
System.out.println("get");
System.out.println(username);
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
/* String username = req.getParameter("username");
System.out.println("post");
System.out.println(username);*/
this.doPost(req,resp);
}
String[] getParametervalue（String name）：根据参数名获取参数值的数组 hobby=xx&hobby=game
@WebServlet("/requestDemo1")
public class requestDemo1 extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String username = req.getParameter("username");
String[] hobbies = req.getParameterValues("hobby");
for (String hobby : hobbies) {
System.out.println(hobby);
}
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doPost(req,resp);
}
Enumeration<String> getParamterNames() 获取所有请求的参数名称
@WebServlet("/requestDemo1")
public class requestDemo1 extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String username = req.getParameter("username");
Enumeration<String> parameterNames = req.getParameterNames();
while (parameterNames.hasMoreElements()){
String name = parameterNames.nextElement();
System.out.println(name);
String parameter = req.getParameter(name);
System.out.println(parameter);
System.out.println("-----------");
}
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doPost(req,resp);
}
map<String,String[]> getParamter():获取所有参数的map结合
@WebServlet("/requestDemo1")
public class requestDemo1 extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String username = req.getParameter("username");
Map<String, String[]> parameterMap = req.getParameterMap();
Set<String> set = parameterMap.keySet();
for (String s : set) {
String[] strings = parameterMap.get(s);
System.out.println(s);
for (String string : strings) {
System.out.println(string);
}
System.out.println("--------------------------");
}
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doPost(req,resp);
}
Request_获取请求参数中文乱码问题处理
中文乱码问题：
get方式：tomcat 8 已经将get方式乱码问题解决了
post方式：会乱码
解决：在获取参数前，设置request的编码request.setCharacterEncoding("utf-8");
@WebServlet("/requestDemo2")
public class requestDemo2 extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
String username = req.getParameter("username");
System.out.println(username);
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doPost(req,resp);
}
}
