html代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>读取复选框数据</title>
</head>
<body>
    <form action="demo03" method="post" target="_blank">
        <label>数学：
            <input type="checkbox" name="math" value="数学">
        </label><br/>
        <label>英语：
            <input type="checkbox" name="English" value="英语">
        </label><br/>
        <label>化学：
            <input type="checkbox" name="chemistry" value="化学">
        </label><br/>
        <label>历史：
            <input type="checkbox" name="history" value="历史">
        </label><br/>
        <label>物理：
            <input type="checkbox" name="physics" value="物理">
        </label><br/>
        <label>语文：
            <input type="checkbox" name="chinese" value="语文">
        </label><br/>
        <input type="submit">
    </form>
</body>
</html>

Servlet代码

//读取复选框数据
public class ServletDemo03 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        resp.setContentType("text/html;charset=utf-8");
        PrintWriter writer = resp.getWriter();
        String header="<!DOCTYPE html>\n" +
                "<html lang=\"en\">\n" +
                "<head>\n" +
                "    <meta charset=\"UTF-8\">\n" +
                "    <title>读取复选框数据</title>\n" +
                "    <style>\n" +
                "        table,tr,td,th{\n" +
                "            border: black 1px solid;\n" +
                "        }\n" +
                "        table{\n" +
                "            border-collapse: collapse;\n" +
                "        }\n" +
                "    </style>\n" +
                "</head>\n" +
                "<body>\n" +
                "    <table>\n" +
                "        <caption>科目</caption>\n" +
                "        <tr>\n" +
                "            <th>参数名称</th>\n" +
                "            <th>参数值</th>\n" +
                "        </tr>";
        writer.println(header);

        Map<String, String[]> parameterMap = req.getParameterMap();
        for(Map.Entry<String,String[]> entry: parameterMap.entrySet()){
            String name = entry.getKey();
            String[] values = entry.getValue();
            for(String value : values){
                writer.println("<tr>\n" +
                        "            <td>"+ name +"</td>\n" +
                        "            <td>"+value+"</td>\n" +
                        "        </tr>");
            }
        }
        writer.println();
        writer.println("    </table>\n" +
                "</body>\n" +
                "</html>");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}