这是我听上学堂张志宇老师讲课的总结
一般用request.getParameter(属性名称)即可。
对于有重名的表单可以采取getParameterNames
import java.io.*;import javax.servlet.*;import javax.servlet.http.*;import java.util.*;//获取所有的参数public class ShowParameters extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=gb2312"); PrintWriter out = response.getWriter(); String title = "Reading All Request Parameters"; out.println("<html><head><title>读取所有参数</title></head>" + "<BODY BGCOLOR='#FDF5E6'>\n" + "<H1 ALIGN=CENTER>" + title + "</H1>\n" + "<TABLE BORDER=1 ALIGN=CENTER>\n" + "<TR BGCOLOR=\"#FFAD00\">\n" + "<TH>Parameter Name<TH>Parameter Value(s)"); Enumeration paramNames = request.getParameterNames(); while (paramNames.hasMoreElements()) { String paramName = (String) paramNames.nextElement(); out.print("<TR><TD>" + paramName + "\n<TD>"); String[] paramValues = request.getParameterValues(paramName); if (paramValues.length == 1) { String paramValue = paramValues[0]; if (paramValue.length() == 0) out.println("<I>No Value</I>"); else out.println(paramValue); } else { out.println("<UL>"); for (int i = 0; i < paramValues.length; i++) { out.println("<LI>" + paramValues[i]); } out.println("</UL>"); } } out.println("</TABLE>\n</BODY></HTML>"); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); }}
利用iterator接口进行迭代。
import java.io.*;import javax.servlet.*;import javax.servlet.http.*;import java.util.*;//获取所有的参数public class ShowParametersMap extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=gb2312"); PrintWriter out = response.getWriter(); String title = "Reading All Request Parameters"; out.println("<html><head><title>读取所有参数</title></head>" + "<BODY BGCOLOR='#FDF5E6'>\n" + "<H1 ALIGN=CENTER>" + title + "</H1>\n" + "<TABLE BORDER=1 ALIGN=CENTER>\n" + "<TR BGCOLOR=\"#FFAD00\">\n" + "<TH>Parameter Name<TH>Parameter Value(s)"); Map<String, String[]> paramMap = request.getParameterMap(); Set<Map.Entry<String, String[]>> entries = paramMap.entrySet(); for(Iterator<Map.Entry<String, String[]>> it = entries.iterator(); it.hasNext(); ) { Map.Entry<String, String[]> entry = it.next(); String paramName = entry.getKey(); out.print("<TR><TD>" + paramName + "\n<TD>"); String[] paramValues = entry.getValue(); if (paramValues.length == 1) { String paramValue = paramValues[0]; if (paramValue.length() == 0) out.println("<I>No Value</I>"); else out.println(paramValue); } else { out.println("<UL>"); for (int i = 0; i < paramValues.length; i++) { out.println("<LI>" + paramValues[i]); } out.println("</UL>"); } } out.println("</TABLE>\n</BODY></HTML>"); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); }}
