Question

高手帮忙！！！解释一段JAVA的程序，要尽量详细！！！

public class TypesAddServlet extends HttpServlet {
public TypesAddServlet() {
super();
public void destroy() {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Validate vd = new Validate();
String name = vd.getUnicode(request.getParameter("name"));
String c1 = vd.getUnicode(request.getParameter("c1"));
String c2 = vd.getUnicode(request.getParameter("c2"));
String c3 = vd.getUnicode(request.getParameter("c3"));
String c4 = vd.getUnicode(request.getParameter("c4"));
if(c1 == null || c1.equals("")){
c1= "无";
if(c2 == null || c2.equals("")){
c2= "无";
if(c3 == null || c3.equals("")){
c3= "无";
if(c4 == null || c4.equals("")){
c4= "无";
}
String sql = "insert into types(name,row1,row2,row3,row4) values('"+name+"','"+c1+"','"+c2+"','"+c3+"','"+c4+"')";
String str = "";
InsertUpdateDelBean ib = new InsertUpdateDelBean();
int flag = ib.insertANDupdateANDdel(sql);
if(flag == -1){
str = "/admin/types_add.jsp";
request.setAttribute("error", "1");
}else{
str = "/admin/types_list.jsp";
request.setAttribute("ok", "1");
RequestDispatcher rd = request.getRequestDispatcher(str);
rd.forward(request, response);
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
public void init() throws ServletException {
package servlet.client;
import bean.SelectBean;
import util.Validate;
public class OperationSearchServlet extends HttpServlet {
public OperationSearchServlet() {
super();
public void destroy() {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Validate vd = new Validate();
String title = vd.getUnicode(request.getParameter("title"));
String types = vd.getUnicode(request.getParameter("types"));
String sql = "select * from operation ";
String[] args = {"id","users","title","content","restricts","types","levels","times","kind","affirm","operationlevel"}
SelectBean sb = new SelectBean();
if(title != null && !title.equals("")){
sql += "where title like '%"+title+"%'";
if(types != null && !types.equals("")){
sql += "where types="+types;
ArrayList al = sb.select(sql, args);
request.setAttribute("operations", al);
RequestDispatcher rd = request.getRequestDispatcher("/client/operation_search.jsp");
rd.forward(request, response);
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
public void init() throws ServletException {

Answer 1

是写的一个servlet吧，如果不知道的话，最好自己先去了解一下什么是servlet

public class TypesAddServlet extends HttpServlet {
//构造函数
public TypesAddServlet() {

//父类构造函数
super();

//销毁
public void destroy() {

//取得request,response//了解一下servlet就会知道的
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

//Validate这个类没有用过，可以查一下JDK，好像也是自定义的吧
Validate vd = new Validate();

//从request取值，比如取得字段为name对应的值
String name = vd.getUnicode(request.getParameter("name"));
String c1 = vd.getUnicode(request.getParameter("c1"));
String c2 = vd.getUnicode(request.getParameter("c2"));
String c3 = vd.getUnicode(request.getParameter("c3"));
String c4 = vd.getUnicode(request.getParameter("c4"));

//判断这些值
if(c1 == null || c1.equals("")){
c1= "无";
if(c2 == null || c2.equals("")){
c2= "无";
if(c3 == null || c3.equals("")){
c3= "无";
if(c4 == null || c4.equals("")){
c4= "无";
}

//SQL语句，这个应该知道吧
String sql = "insert into types(name,row1,row2,row3,row4) values('"+name+"','"+c1+"','"+c2+"','"+c3+"','"+c4+"')";
String str = "";

//InsertUpdateDelBean类没有用过，应该是在什么地方定义的吧
InsertUpdateDelBean ib = new InsertUpdateDelBean();
//应该是判断是否插入之类的，要根据那些类的定义看
int flag = ib.insertANDupdateANDdel(sql);
if(flag == -1){
str = "/admin/types_add.jsp";
//对request设置值，将“1”设置到error字段中
request.setAttribute("error", "1");
}else{
str = "/admin/types_list.jsp";
//设值
request.setAttribute("ok", "1");
//这点不知道
RequestDispatcher rd = request.getRequestDispatcher(str);
//跳转页面
rd.forward(request, response);

//servlet的方法doPost
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
//初始化servlet
public void init() throws ServletException {

//?????
没完？？
//??

//下面同理，如果还是不清楚就没有办法了

package servlet.client;
import bean.SelectBean;
import util.Validate;
public class OperationSearchServlet extends HttpServlet {
public OperationSearchServlet() {
super();
public void destroy() {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Validate vd = new Validate();
String title = vd.getUnicode(request.getParameter("title"));
String types = vd.getUnicode(request.getParameter("types"));
String sql = "select * from operation ";
String[] args = {"id","users","title","content","restricts","types","levels","times","kind","affirm","operationlevel"}
SelectBean sb = new SelectBean();
if(title != null && !title.equals("")){
sql += "where title like '%"+title+"%'";
if(types != null && !types.equals("")){
sql += "where types="+types;
ArrayList al = sb.select(sql, args);
request.setAttribute("operations", al);
RequestDispatcher rd = request.getRequestDispatcher("/client/operation_search.jsp");
rd.forward(request, response);
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
public void init() throws ServletException {

学一下什么是servlet就知道这些了

Answer 2

是啊，就是一个简单的servlet。先学一下，再看就简单多了 ！

Answer 3

不就是一servlet？

Answer 4

牛比。。。
这都能解释。哈哈。。。