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根据标签查询最新的项目和最热门的项目，默认标签为0时查询全部项目。

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This commit is contained in:
Zhang Liguo
2023-07-01 13:51:00 +08:00
parent ea534747c1
commit fced648a4d
8 changed files with 21 additions and 205 deletions
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19
src/com/hellogithub/dao/UserDao.java
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@@ -4,6 +4,7 @@ import com.hellogithub.entity.userEntity;
import com.hellogithub.utils.JdbcUtils; import com.hellogithub.utils.JdbcUtils;
import org.apache.commons.dbutils.QueryRunner; import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler; import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;
import java.sql.*; import java.sql.*;
@@ -171,24 +172,6 @@ public class UserDao {
return num; return num;
} }
/*
*
* 返回用户总数
* */
public int queryUserCount(){
int num;
try {
Connection conn = JdbcUtils.getConnection();
QueryRunner runner = new QueryRunner();
String sql="select count(*) from user";
num = runner.query(conn,sql,new BeanHandler<>(Integer.class));
} catch (SQLException e) {
throw new RuntimeException(e);
}
return num;
}
public Long retUserNum(){ public Long retUserNum(){
Long count; Long count;
try { try {

3
src/com/hellogithub/dao/projectDao.java
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@@ -153,4 +153,7 @@ public class projectDao {
return projectEntityList; return projectEntityList;
} }
} }

77
src/com/hellogithub/service/projectService.java
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@@ -4,10 +4,8 @@ import com.hellogithub.dao.UserDao;
import com.hellogithub.dao.projectDao; import com.hellogithub.dao.projectDao;
import com.hellogithub.entity.projectEntity; import com.hellogithub.entity.projectEntity;
import java.util.HashMap; import java.sql.Array;
import java.util.Iterator; import java.util.*;
import java.util.List;
import java.util.Map;
public class projectService { public class projectService {
@@ -109,76 +107,17 @@ public class projectService {
} }
return projectEntityList; return projectEntityList;
} }
/**
* 返回根据标签查询最热门的项目
* */
public List<projectEntity> retSelcetByStar(int cate){ public List<projectEntity> retSelcetByStar(int cate){
Map<Integer,String> dataMap=new HashMap<>();
dataMap.put(1,"C项目");
dataMap.put(2,"C#项目");
dataMap.put(3,"C++项目");
dataMap.put(4,"CSS项目");
dataMap.put(5,"Go项目");
dataMap.put(6,"Java项目");
dataMap.put(7,"Javascript项目");
dataMap.put(8,"Kotlin项目");
dataMap.put(9,"Obejctive-C项目");
dataMap.put(10,"PHP项目");
dataMap.put(11,"Python项目");
dataMap.put(12,"Ruby项目");
dataMap.put(13,"Rust项目");
dataMap.put(14,"Swift项目");
dataMap.put(15,"其他");
dataMap.put(16,"开源书籍");
dataMap.put(17,"机器学习");
List<projectEntity> projectEntityList;
if (cate==0){ if (cate==0){
projectEntityList =projectDao.retMostStar(); return projectDao.retMostStar();
for(int i =0;i<projectEntityList.size();i++)
{
projectEntity projectEntity = projectEntityList.get(i);
projectEntity.setCategoryName(dataMap.get(projectEntity.getCategoryId()));
}
}else { }else {
projectEntityList =projectDao.retSelcetByStartNum(cate); return projectDao.retSelcetByStartNum(cate);
for(int i =0;i<projectEntityList.size();i++)
{
projectEntity projectEntity = projectEntityList.get(i);
projectEntity.setCategoryName(dataMap.get(projectEntity.getCategoryId()));
} }
} }
return projectEntityList;
}
public List<projectEntity> selectByInput(String str){
Map<Integer,String> dataMap=new HashMap<>();
dataMap.put(1,"C项目");
dataMap.put(2,"C#项目");
dataMap.put(3,"C++项目");
dataMap.put(4,"CSS项目");
dataMap.put(5,"Go项目");
dataMap.put(6,"Java项目");
dataMap.put(7,"Javascript项目");
dataMap.put(8,"Kotlin项目");
dataMap.put(9,"Obejctive-C项目");
dataMap.put(10,"PHP项目");
dataMap.put(11,"Python项目");
dataMap.put(12,"Ruby项目");
dataMap.put(13,"Rust项目");
dataMap.put(14,"Swift项目");
dataMap.put(15,"其他");
dataMap.put(16,"开源书籍");
dataMap.put(17,"机器学习");
List<projectEntity> projectEntityList = projectDao.selectByInput(str);
for(int i =0;i<projectEntityList.size();i++)
{
projectEntity projectEntity = projectEntityList.get(i);
projectEntity.setCategoryName(dataMap.get(projectEntity.getCategoryId()));
} }
return projectEntityList;
}
}

73
src/com/hellogithub/servlet/selectByInputServlet.java
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@@ -1,73 +0,0 @@
package com.hellogithub.servlet;
import com.alibaba.fastjson.JSONObject;
import com.hellogithub.entity.projectEntity;
import com.hellogithub.service.projectService;
import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.List;
public class selectByInputServlet extends HttpServlet {
private com.hellogithub.service.projectService projectService=new projectService();
@Override
public void init(ServletConfig config) throws ServletException {
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=utf-8");
// 设置响应头允许ajax跨域访问
String curOrigin = req.getHeader("Origin");
resp.setHeader("Access-Control-Allow-Origin", curOrigin == null ? "true" : curOrigin);
resp.setHeader("Access-Control-Allow-Credentials", "true");
resp.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD");
resp.setHeader("Access-Control-Max-Age", "3600");
resp.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");
resp.setContentType("application/json;charset=UTF-8");
//返回最新期刊数字
PrintWriter writer = resp.getWriter();
String str = req.getParameter("xxxxx");
List<projectEntity> projectEntityList = projectService.selectByInput(str);
if(projectEntityList.size() == 0 ){
setResultError("查询结果为空",writer);
}
else{
String jsonString = JSONObject.toJSONString(projectEntityList);
setResultOK("success",writer);
writer.println(jsonString);
writer.close();
setResultOK("success",writer);
}
}
public void setResult(Integer code, String msg, PrintWriter writer) {
HashMap<String, Object> result = new HashMap<>();
result.put("code", code);
result.put("msg", msg);
String jsonString = JSONObject.toJSONString(result);
writer.println(jsonString);
writer.close();
}
public void setResultError(String msg, PrintWriter writer) {
setResult(500, msg, writer);
}
public void setResultOK(String msg, PrintWriter writer) {
setResult(200, msg, writer);
}
}

2
src/com/hellogithub/servlet/selectLastByCateServlet.java
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@@ -42,7 +42,7 @@ public class selectLastByCateServlet extends HttpServlet {
resp.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With"); resp.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");
resp.setContentType("application/json;charset=UTF-8"); resp.setContentType("application/json;charset=UTF-8");
String cate = req.getParameter("num"); String cate = req.getParameter("cate");
PrintWriter writer = resp.getWriter(); PrintWriter writer = resp.getWriter();
String jsonString = JSONObject.toJSONString(projectService.retLatestProject(Integer.valueOf(cate))); String jsonString = JSONObject.toJSONString(projectService.retLatestProject(Integer.valueOf(cate)));
writer.println(jsonString); writer.println(jsonString);

9
src/com/hellogithub/servlet/selectMostStarServlet.java
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@@ -11,7 +11,11 @@ import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException; import java.io.IOException;
import java.io.PrintWriter; import java.io.PrintWriter;
/**
* 根据标签查询最热门的项目
*
*
*/
@WebServlet("/selectMostStar") @WebServlet("/selectMostStar")
public class selectMostStarServlet extends HttpServlet { public class selectMostStarServlet extends HttpServlet {
private projectService projectService=new projectService(); private projectService projectService=new projectService();
@@ -38,8 +42,7 @@ public class selectMostStarServlet extends HttpServlet {
resp.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With"); resp.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");
resp.setContentType("application/json;charset=UTF-8"); resp.setContentType("application/json;charset=UTF-8");
String cate = req.getParameter("num"); String cate = req.getParameter("cate");
PrintWriter writer = resp.getWriter(); PrintWriter writer = resp.getWriter();
String jsonString = JSONObject.toJSONString(projectService.retSelcetByStar(Integer.valueOf(cate))); String jsonString = JSONObject.toJSONString(projectService.retSelcetByStar(Integer.valueOf(cate)));
writer.println(jsonString); writer.println(jsonString);

39
src/com/hellogithub/servlet/userNumServlet.java
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@@ -5,9 +5,6 @@ import com.hellogithub.dao.UserDao;
import jakarta.servlet.ServletConfig; import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletException; import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet; import jakarta.servlet.annotation.WebServlet;
import com.hellogithub.service.UserService;
import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet; import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest; import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse; import jakarta.servlet.http.HttpServletResponse;
@@ -23,20 +20,12 @@ public class userNumServlet extends HttpServlet {
@Override @Override
public void init(ServletConfig config) throws ServletException { public void init(ServletConfig config) throws ServletException {
super.init(config); super.init(config);
import java.util.HashMap;
public class userNumServlet extends HttpServlet {
private UserService userService = new UserService();
@Override
public void init(ServletConfig config) throws ServletException {
} }
@Override @Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req,resp); doPost(req,resp);
doPost(req, resp);
} }
@Override @Override
@@ -62,33 +51,5 @@ public class userNumServlet extends HttpServlet {
@Override @Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
super.service(req, resp); super.service(req, resp);
int num = userService.queryUserCount();
String str= "num:"+num ;
String jsonString = JSONObject.toJSONString(str);
writer.println(jsonString);
if(num == 0)
{
setResultError("用户总数为空",writer);
}else{
setResultOK("success",writer);
}
writer.close();
}
public void setResult(Integer code, String msg, PrintWriter writer) {
HashMap<String, Object> result = new HashMap<>();
result.put("code", code);
result.put("msg", msg);
String jsonString = JSONObject.toJSONString(result);
writer.println(jsonString);
writer.close();
}
public void setResultError(String msg, PrintWriter writer) {
setResult(500, msg, writer);
}
public void setResultOK(String msg, PrintWriter writer) {
setResult(200, msg, writer);
} }
} }

2
src/config.properties
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@@ -1,4 +1,4 @@
driverClass=com.mysql.cj.jdbc.Driver driverClass=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/hellogithub?serverTimezone=GMT%2B8 url=jdbc:mysql://127.0.0.1:3306/hellogithub?serverTimezone=GMT%2B8
user=root user=root
password=1611 password=123456