Java课程设计

1. 题目及要求

基于学校的搜索引擎

负责部分：Java GUI设计

2.界面调查

1)调查界面：百度

2)思考：

根据我的调查，我认为我需要完成三个界面的设计：

第一个是调查主界面，里面有一个集美大学的logo，一个搜索框用文本字段，因为需要在里面写入搜索内容，一个搜索按钮用button，这个按钮完成的功能就是输入搜索内容后，点击搜索按钮，可以跳转到下一个界面，并且返回结果。

第二个界面是搜索结果界面：需要的是一个再次搜索框，用文本字段；一个再次搜索按钮，用button；一个面板JPanel，用来盛放我搜索到的结果；在界面的最底下还有三个按钮，一个文本框，分别是：上一页，下一页，跳转，和相应页面表示，当数据量过大需要分页时，就是用来实现页面的跳转的。

第三个就是结果展示界面：一个jLabel，展示标题；一个文本区域展示内容；一个按钮，点击能够跳转到原网页浏览。

3.我的代码

1.EsGuiSearch.java

package edu.net.itsearch.gui;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import org.elasticsearch.index.query.BoolQueryBuilder;

import org.elasticsearch.index.query.QueryBuilders;

import org.elasticsearch.search.builder.SearchSourceBuilder;

import crawler.SearchResultEntry;

import edu.net.itsearch.elasticsearch.EsClient;

import io.searchbox.client.JestClient;

import io.searchbox.core.Search;

import io.searchbox.core.SearchResult;

/**

*

* @author xingkyh

*/

public class EsGuiSearch {

private JestClient jestClient;

public EsGuiSearch() {

this.jestClient=EsClient.getJestClient();

}

/**

* 全文检索

*

* @param queryString 搜索字符串

* @return 检索结果

*/

public List fullTextSerch(String queryString) {

// 声明一个搜索请求体

SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();

boolQueryBuilder.must(QueryBuilders.queryStringQuery(queryString));

searchSourceBuilder.query(boolQueryBuilder);

// 设置分页

searchSourceBuilder.from(0);

searchSourceBuilder.size(800);

// 构建Search对象

Search search = new Search.Builder(searchSourceBuilder.toString()).addIndex(EsClient.indexName)

.addType(EsClient.typeName).build();

SearchResult searchResult = null;

try {

searchResult = jestClient.execute(search);

} catch (IOException e) {

e.printStackTrace();

}

List list=new ArrayList();

List> hits = searchResult.getHits(SearchResultEntry.class);

for (SearchResult.Hit hit : hits) {

list.add(hit.source);

}

return list;

}

public void close() throws IOException {

EsClient.closeJestClient();

}

}

2.SearchMainPage.java

/*

* To change this license header, choose License Headers in Project Properties.

* To change this template file, choose Tools | Templates

* and open the template in the editor.

*/

package edu.net.itsearch.gui;

import java.util.List;

import javax.swing.JOptionPane;

import crawler.SearchResultEntry;

/**

*

* @author 格格

*/

public class SearchMainPage extends javax.swing.JFrame {

/**

* Creates new form searchMainPage

*/

public SearchMainPage() {

initComponents();

esGuiSearch=new EsGuiSearch();

}

/**

* This method is called from within the constructor to initialize the form.

* WARNING: Do NOT modify this code. The content of this method is always

* regenerated by the Form Editor.

*/

@SuppressWarnings("unchecked")

private void initComponents() {

searchBox = new javax.swing.JTextField();

searchButton = new javax.swing.JButton();

picture = new javax.swing.JLabel();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

searchButton.setText("搜索");

searchButton.addActionListener(new java.awt.event.ActionListener() {

@Override

public void actionPerformed(java.awt.event.ActionEvent evt) {

searchButtonActionPerformed(evt);

}

});

picture.setIcon(new javax.swing.ImageIcon(getClass().getResource("jmu.png")));

picture.setText("jLabel2");

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

getContentPane().setLayout(layout);

layout.setHorizontalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addGap(68, 68, 68)

.addComponent(searchBox, javax.swing.GroupLayout.PREFERRED_SIZE, 516, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(18, 18, 18)

.addComponent(searchButton, javax.swing.GroupLayout.DEFAULT_SIZE, 78, Short.MAX_VALUE)

.addContainerGap())

.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()

.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

.addComponent(picture, javax.swing.GroupLayout.PREFERRED_SIZE, 168, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(256, 256, 256))

);

layout.setVerticalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()

.addGap(46, 46, 46)

.addComponent(picture)

.addGap(36, 36, 36)

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(searchBox, javax.swing.GroupLayout.PREFERRED_SIZE, 54, javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(searchButton, javax.swing.GroupLayout.PREFERRED_SIZE, 54, javax.swing.GroupLayout.PREFERRED_SIZE))

.addContainerGap(140, Short.MAX_VALUE))

);

pack();

}//

private void searchButtonActionPerformed(java.awt.event.ActionEvent evt) {

String queryString=searchBox.getText();

List list = esGuiSearch.fullTextSerch(queryString);

if(list.isEmpty()) {

JOptionPane.showMessageDialog(null, "未搜索到相关内容！");

}else {

SearchResult searchResult = new SearchResult(list);

searchResult.setVisible(true);

dispose();

}

}

private EsGuiSearch esGuiSearch;

private javax.swing.JLabel picture;

private javax.swing.JTextField searchBox;

private javax.swing.JButton searchButton;

// End of variables declaration

}

3.SearchResult.java

/*

* To change this license header, choose License Headers in Project Properties.

* To change this template file, choose Tools | Templates

* and open the template in the editor.

*/

package edu.net.itsearch.gui;

import java.awt.GridLayout;

import java.util.ArrayList;

import java.util.List;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import crawler.SearchResultEntry;

/**

*

* @author 格格

*/

public class SearchResult extends javax.swing.JFrame {

/**

* Creates new form searchResult

*/

public SearchResult() {

initComponents();

}

public SearchResult(List list){

initComponents();

esGuiSearch=new EsGuiSearch();

resultList = getJpanelList(list);

resultNum = list.size();

pageNum = (resultList.size()+1)/2;

currentPage = 1;

displayResult();

}

private void displayResult(){

resultJpanel.removeAll();

resultJpanel.setLayout(new GridLayout(2, 1));

resultJpanel.add(resultList.get(currentPage*2-2));

if(currentPage+currentPage <= resultNum){

resultJpanel.add(resultList.get(currentPage*2-1));

}

resultJpanel.revalidate();

resultJpanel.repaint();

page.setText(currentPage+"/"+pageNum);

}

/**

* This method is called from within the constructor to initialize the form.

* WARNING: Do NOT modify this code. The content of this method is always

* regenerated by the Form Editor.

*/

@SuppressWarnings("unchecked")

private void initComponents() {

searchAgainButton = new javax.swing.JButton();

resultJpanel = new javax.swing.JPanel();

jumpLastPage = new javax.swing.JButton();

jumpNextPage = new javax.swing.JButton();

jumpChoosePage = new javax.swing.JButton();

searchAgainBox = new javax.swing.JTextField();

page = new javax.swing.JTextField();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

searchAgainButton.setText("搜索");

searchAgainButton.addActionListener(new java.awt.event.ActionListener() {

@Override

public void actionPerformed(java.awt.event.ActionEvent evt) {

searchAgainButtonPerformed(evt);

}

});

javax.swing.GroupLayout resultJpanelLayout = new javax.swing.GroupLayout(resultJpanel);

resultJpanel.setLayout(resultJpanelLayout);

resultJpanelLayout.setHorizontalGroup(

resultJpanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGap(0, 0, Short.MAX_VALUE)

);

resultJpanelLayout.setVerticalGroup(

resultJpanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGap(0, 276, Short.MAX_VALUE)

);

jumpLastPage.setText("上一页");

jumpLastPage.addActionListener(new java.awt.event.ActionListener() {

@Override

public void actionPerformed(java.awt.event.ActionEvent evt) {

jumpLastPageActionPerformed(evt);

}

});

jumpNextPage.setText("下一页");

jumpNextPage.addActionListener(new java.awt.event.ActionListener() {

@Override

public void actionPerformed(java.awt.event.ActionEvent evt) {

jumpNextPageActionPerformed(evt);

}

});

jumpChoosePage.setText("页数跳转");

jumpChoosePage.addActionListener(new java.awt.event.ActionListener() {

@Override

public void actionPerformed(java.awt.event.ActionEvent evt) {

jumpChoosePageActionPerformed(evt);

}

});

searchAgainBox.setText("");

page.setText("1");

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

getContentPane().setLayout(layout);

layout.setHorizontalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()

.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

.addComponent(page, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(18, 18, 18)

.addComponent(jumpLastPage)

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)

.addComponent(jumpNextPage)

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)

.addComponent(jumpChoosePage)

.addGap(12, 12, 12))

.addGroup(layout.createSequentialGroup()

.addContainerGap()

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(resultJpanel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

.addGroup(layout.createSequentialGroup()

.addComponent(searchAgainBox, javax.swing.GroupLayout.PREFERRED_SIZE, 584, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(18, 18, 18)

.addComponent(searchAgainButton, javax.swing.GroupLayout.PREFERRED_SIZE, 72, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(0, 26, Short.MAX_VALUE)))

.addContainerGap())

);

layout.setVerticalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addContainerGap()

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(searchAgainBox, javax.swing.GroupLayout.PREFERRED_SIZE, 48, javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(searchAgainButton, javax.swing.GroupLayout.DEFAULT_SIZE, 48, Short.MAX_VALUE))

.addGap(27, 27, 27)

.addComponent(resultJpanel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 33, Short.MAX_VALUE)

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(jumpLastPage)

.addComponent(jumpNextPage)

.addComponent(jumpChoosePage)

.addComponent(page, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

.addContainerGap())

);

pack();

}//

private void searchAgainButtonPerformed(java.awt.event.ActionEvent evt) {

String queryString=searchAgainBox.getText();

List list=esGuiSearch.fullTextSerch(queryString);

if(list.isEmpty()) {

JOptionPane.showMessageDialog(null, "未搜索到相关内容！");

}else {

resultList = getJpanelList(list);

resultNum = list.size();

pageNum = (resultList.size()+1)/2;

currentPage = 1;

displayResult();

}

}

private void jumpLastPageActionPerformed(java.awt.event.ActionEvent evt) {

if(currentPage == 1){

JOptionPane.showMessageDialog(null, "当前已为第一页，无法进入上一页！");

}else{

currentPage--;

displayResult();

}

}

private void jumpNextPageActionPerformed(java.awt.event.ActionEvent evt) {

if(currentPage == pageNum){

JOptionPane.showMessageDialog(null, "当前已为最后一页，无法进入下一页！");

}else{

currentPage++;

displayResult();

}

}

private void jumpChoosePageActionPerformed(java.awt.event.ActionEvent evt) {

int jumpPage = Integer.valueOf(page.getText());

if(jumpPage >= 1 && jumpPage <= pageNum){

currentPage = jumpPage;

displayResult();

}else{

JOptionPane.showMessageDialog(null, "输入页数不合法，请输入1-"+pageNum+"中的数字");

}

}

private List getJpanelList(List list) {

List resultList = new ArrayList<>();

for(SearchResultEntry e:list){

JPanel jPanel=new SearchLook(e);

resultList.add(jPanel);

}

return resultList;

}

private List resultList;

private int pageNum;

private int currentPage;

private int resultNum;

private EsGuiSearch esGuiSearch;

private javax.swing.JButton jumpChoosePage;

private javax.swing.JButton jumpLastPage;

private javax.swing.JButton jumpNextPage;

private javax.swing.JTextField page;

private javax.swing.JPanel resultJpanel;

private javax.swing.JTextField searchAgainBox;

private javax.swing.JButton searchAgainButton;

// End of variables declaration

}

4.SearchLook.java

/*

* To change this license header, choose License Headers in Project Properties.

* To change this template file, choose Tools | Templates

* and open the template in the editor.

*/

package edu.net.itsearch.gui;

import java.awt.Desktop;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.net.URI;

import crawler.SearchResultEntry;

/**

*

* @author 格格

*/

public class SearchLook extends javax.swing.JPanel {

/**

* Creates new form SearchLook

*/

public SearchLook() {

initComponents();

}

public SearchLook(SearchResultEntry result) {

initComponents();

titleJlabel.setText(result.getTitle());

textArea.setText(result.getText());

url = result.getUrl();

}

/**

* This method is called from within the constructor to initialize the form.

* WARNING: Do NOT modify this code. The content of this method is always

* regenerated by the Form Editor.

*/

@SuppressWarnings("unchecked")

/** */

private void initComponents() {

titleJlabel = new javax.swing.JLabel();

jumpJbutton = new javax.swing.JButton();

jScrollPane1 = new javax.swing.JScrollPane();

textArea = new javax.swing.JTextArea();

titleJlabel.setText("jLabel1");

jumpJbutton.setText("跳转");

jumpJbutton.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

if(Desktop.isDesktopSupported()){

try {

URI uri=URI.create(url);

Desktop dp=Desktop.getDesktop();

if(dp.isSupported(Desktop.Action.BROWSE)){

dp.browse(uri);

}

} catch (Exception o) {

o.printStackTrace();

}

}

}

});

textArea.setColumns(20);

textArea.setRows(5);

textArea.setLineWrap(true);

textArea.setWrapStyleWord(true);

jScrollPane1.setViewportView(textArea);

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);

this.setLayout(layout);

layout.setHorizontalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addContainerGap(36, Short.MAX_VALUE)

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()

.addComponent(titleJlabel, javax.swing.GroupLayout.PREFERRED_SIZE, 522, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(30, 30, 30)

.addComponent(jumpJbutton)

.addContainerGap())

.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()

.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 633, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(31, 31, 31))))

);

layout.setVerticalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(titleJlabel, javax.swing.GroupLayout.PREFERRED_SIZE, 29, javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(jumpJbutton))

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)

.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 85, Short.MAX_VALUE)

.addContainerGap())

);

}//

private String url;

private javax.swing.JScrollPane jScrollPane1;

private javax.swing.JButton jumpJbutton;

private javax.swing.JTextArea textArea;

private javax.swing.JLabel titleJlabel;

// End of variables declaration

}

关键代码

4.运行结果截图

1.

2.

3.

4.

5.

5.遇到的问题

1)在SearchLook.java类中，用来放文本和标题的容器不知道用JLabel还是Jframe，最终经过百度查询资料，选择的JLabel，原因如下：JFrame是一个顶层的框架类，好比一个窗户的框子。也是一个容器类，这个框子可以嵌入几个玻璃窗，就是说Jframe可以将标签文本和按钮安放并处理，而且能实现最小化/最大化、改变大小、移动等功能特性。而JPanel是一个容器类，相当于一大玻璃窗，可以放置文本框按钮等非容器组件。在结果展示中，我只需要一个JLabel和一个文本区域和一个按钮，所以我选择JPanel。

2)第一次从net beans转到eclipse上编写时发现错误，后来经过检查发现是因为照片文件的问题，获取照片文件的相对路径为当前包，第一开始我单独放在别的包里，移到gui包后就可以正常运行了。

6.git提交记录

7.我的感想

我本身的代码基础不是很扎实，所以课设中很多部分都无法完成，只能实现Gui界面的设计与部分代码的编写。通过这次Java课设，从队友的指导，百度的搜索还有书本上的知识等等地方学到了好多关于Gui的知识，从容器插件还有监听器等等。虽然功能简单，但是我也遇到了不少的问题，比如说第一次写监听器是无法运行，原因就是我调用的类不对。还有就是跳转到网页时遇到了很多困难，研究了很久才解决。我设计的Gui界面有一些不足，但是我还是从中学到了很多，这次课设我受益匪浅。

8.团队博客链接