java小东东。广东精鹰软件工作室(刘正仁)

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最新推荐文章于 2025-08-23 19:36:46 发布

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分类专栏： java 文章标签： java 工作 import string action exception

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本文提供了多个Java开发的功能实现示例，包括富文本编辑框使用、内嵌页与Struts结合、异步加载树、多附件上传与Struts结合、系统异常处理、网页调用Word打印以及Servlet中用iText生成PDF等，且均给出了详细代码。

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以下内容经本人（刘正仁）测试成功，如在使用的过程中有任何问题，请与我联系

（1）：富文本编辑框的使用。

源程序如下：

<%@ page contentType="text/html; charset=utf-8" language="java"%>

<%@include file="/support/template/taglibs.jsp"%>

<HTML>

<HEAD>

_editor_url = "<%=baseURL%>/support/HTMLArea/";

_editor_lang = "gb";

var editor = null;

function initEditor() {

editor = new HTMLArea("ta");

editor.generate();

}

</script>

</HEAD>

function getValue()

{

document.all("test").onsubmit()

alert(document.all("ta").value)

}

</script>

<html:form action="/edit.do" method="post" styleId="test">

<tr>

<html:textarea property="username" styleId="ta" rows="20" cols="80">

</html:textarea>

</tr>

</table>

<html:submit>submit

</html:submit>

</html:form>

</body>

</HTML>

（2）内嵌页与struts结合的使用。

1． 1 action 代码

package test;

import org.apache.struts.actions.*;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.upload.MultipartRequestWrapper;

import org.apache.struts.util.MessageResources;

import test.TestStruts;

public class TestInclude extends Action {

public ActionForward execute(

ActionMapping mapping,

ActionForm form,

HttpServletRequest request,

HttpServletResponse response)

throws Exception {

// Create a RequestDispatcher the corresponding resource

String path = mapping.getParameter();

if (path == null) {

throw new ServletException(messages.getMessage("include.path"));

}

RequestDispatcher rd =

servlet.getServletContext().getRequestDispatcher(path);

if (rd == null) {

throw new ServletException(messages.getMessage("include.rd", path));

}

// Unwrap the multipart request, if there is one.

if (request instanceof MultipartRequestWrapper) {

request = ((MultipartRequestWrapper) request).getRequest();

}

// 在这里组织好formbean

String id=request.getParameter("id");

System.out.println("id="+id);

((TestStruts)form).setUsername("bbbbb");

// request.setAttribute("testForm",form);

// Forward control to the specified resource

rd.include(request, response);

// Tell the controller servlet that the response has been created

return (null);

}

2． Action 中的配置

3: 主页面代码

<%@page contentType="text/html; charset=UTF-8"%>

<html>

<head>

<title>testI</title>

</head>

<h1>

<jsp:include flush="true" page="/test.do?id=1"></jsp:include>

</h1>

</body>

</html>

4 : 嵌入页面代码

<%@ page contentType="text/html; charset=UTF-8" %>

<%@include file="/support/template/taglibs.jsp"%>

<html>

<head>

<title>

testInclude

</title>

</head>

<h1>

<bean:write name="testForm" property="username"/>

</h1>

</body>

</html>

(3):异步加载树的使用

1：树的页面源程序。

<%@ page contentType="text/html;charset=gb2312"%>

response.setDateHeader("Expires",(new java.util.Date(0)).getTime());

request.setCharacterEncoding("GBK");

<%String baseURL=request.getContextPath();%>

<html>

<head>

/// 改变系统默认图标，将树显示成XP风格

webFXTreeConfig.rootIcon = "<%=baseURL%>/images/xloadtree/folder.png";

webFXTreeConfig.openRootIcon = "<%=baseURL%>/images/xloadtree/openfolder.png";

webFXTreeConfig.folderIcon = "<%=baseURL%>/images/xloadtree/folder.png";

webFXTreeConfig.openFolderIcon = "<%=baseURL%>/images/xloadtree/openfolder.png";

webFXTreeConfig.fileIcon = "<%=baseURL%>/images/xloadtree/user.gif";

webFXTreeConfig.lMinusIcon = "<%=baseURL%>/images/xloadtree/Lminus.png";

webFXTreeConfig.lPlusIcon = "<%=baseURL%>/images/xloadtree/Lplus.png";

webFXTreeConfig.tMinusIcon = "<%=baseURL%>/images/xloadtree/Tminus.png";

webFXTreeConfig.tPlusIcon = "<%=baseURL%>/images/xloadtree/Tplus.png";

webFXTreeConfig.iIcon = "<%=baseURL%>/images/xloadtree/I.png";

webFXTreeConfig.lIcon = "<%=baseURL%>/images/xloadtree/L.png";

webFXTreeConfig.tIcon = "<%=baseURL%>/images/xloadtree/T.png";

webFXTreeConfig.blankIcon = '<%=baseURL%>/images/xloadtree/blank.png';

//显示根（同时从服务获取所有主分类节点）

var tree = new WebFXLoadTree("集团","<%=baseURL%>/servlet/CategoryService?GetType=0",null,"doNothing()")

//显示第一级节点

function doCategoryAction(name){

alert(name)

}

function doPriCategoryAction(name){

alert(name)

}

function doNothing()

{

}

</script>

</head>

document.write(tree);

</script>

</body>

</html>

2：服务servlet代码

package servlet;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.ArrayList;

import java.util.Collection;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class CategoryService extends HttpServlet {

private static final String CONTENT_TYPE = "text/xml;charset=GBK";

private String urlBase="";

/**

* Constructor of the object.

public CategoryService() {

super();

}

/**

* Destruction of the servlet. <br>

public void destroy() {

super.destroy(); // Just puts "destroy" string in log

// Put your code here

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

urlBase=request.getContextPath();

response.setContentType(CONTENT_TYPE);

request.setCharacterEncoding("GBK");

PrintWriter out = response.getWriter();

String strXML = "<?xml version=/"1.0/" encoding=/"GBK/"?>/n";

strXML += "/t<tree>/n";

int getType = Integer.parseInt( (String) request.getParameter("GetType"));

if (getType == 0) {

//获取所有主分类的XML

strXML += MakePriCategorySetXML();

}

else if (getType == 1) {

//获取某个主分类下所有文档分类的XML

int comid = Integer.parseInt( (String) request.getParameter(

"comid"));

strXML += makeItemsInPriCategoryXML(comid);

}

strXML += "/t</tree>/n";

out.print(strXML);

System.out.println(strXML);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doGet(request,response);

}

/**

* 创建每一个节点的XML文本

* @param name String

* @param action String

* @param src String

* @param icon String

* @param openIcon String

* @return String

private String MakeItemXML(String name, String action, String src,

String icon, String openIcon) {

String strXML = "/t";

strXML += "<tree text=/"" + name + "/"";

strXML += " action=/"" + action + "/"";

if (src != null) {

strXML += " src=/"" + src + "/"";

}

if (icon != null) {

strXML += " icon=/"" + icon + "/"";

}

if (openIcon != null) {

strXML += " openIcon=/"" + openIcon + "/"";

}

strXML += "/>/n";

return strXML;

}

/**

* 获取所有主分类节点的XML文本

* @return String

private String MakePriCategorySetXML() {

String strXML = "";

try {

String name="";

Collection c=new ArrayList();

Copmany com=new Copmany();

com.setId(1);

com.setName("测试公司1");

c.add(com);

com=new Copmany();

com.setId(1);

com.setName("测试公司1");

c.add(com);

com=new Copmany();

com.setId(2);

com.setName("测试公司2");

c.add(com);

com=new Copmany();

com.setId(3);

com.setName("测试公司3");

c.add(com);

Object [] o=c.toArray();

for(int i=0;i<o.length;i++) {

name=((Copmany)o[i]).getName();

int id=((Copmany)o[i]).getId();

String action = "javascript:doPriCategoryAction('" + name +"')";

String icon = urlBase+"/images/xloadtree/folder.png";

String openIcon = urlBase+"/images/xloadtree/openfolder.png";

String src=urlBase+"/servlet/CategoryService?GetType=1&comid="+id;

strXML += MakeItemXML(name, action, src, icon, openIcon);

}

catch (Exception ex) {}

return strXML;

}

/**

* 获取某个主分类下的所有文档分类的XML

* @param priCatID int

* @return String

private String makeItemsInPriCategoryXML(int comid) {

String strXML = "";

String name="";

try {

//根据公司id找到相应的部门

for(int i=0;i<300;i++)

{

name="name"+i;

String action = "javascript:doCategoryAction('"+name+"')";

String icon = urlBase+"/images/xloadtree/folder.png";

String openIcon =urlBase+"/images/xloadtree/openfolder.png";

String src=null;

//判断是否存在有下一级，有的话则要继续。

// if (dao.hasChildren(id)) {

//String src =urlBase+"/servlet/CategoryService?GetType=2";

//}

strXML += MakeItemXML(name, action, src, icon, openIcon);

}

catch (Exception ex) {}

return strXML;

}

public void init() throws ServletException {

// Put your code here

}

(4):jfreeChar报表在html中显示

1 :servlet中生成图案代码

package test.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.jfree.chart.ChartFactory;

import org.jfree.chart.ChartUtilities;

import org.jfree.chart.JFreeChart;

import org.jfree.data.DefaultPieDataset;

public class ChartDemoServlet extends HttpServlet {

public ChartDemoServlet() {

super();

}

/**

* Destruction of the servlet. <br>

public void destroy() {

super.destroy(); // Just puts "destroy" string in log

// Put your code here

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("image/jpeg");

DefaultPieDataset data = getDataSet();

JFreeChart chart = ChartFactory.createPieChart("水果产量图",data,true,false,false);

ChartUtilities.writeChartAsJPEG(response.getOutputStream(),100,chart,400,300,null);

}

/**

* 获取一个演示用的简单数据集对象

* @return

//以下要替换成自己从数据中得到的数据

private static DefaultPieDataset getDataSet() {

DefaultPieDataset dataset = new DefaultPieDataset();

dataset.setValue("苹果",100);

dataset.setValue("梨子",200);

dataset.setValue("葡萄",300);

dataset.setValue("香蕉",400);

dataset.setValue("荔枝",500);

return dataset;

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doGet(request,response);

}

public void init() throws ServletException {

// Put your code here

}

2：jsp页面调用的代码

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<html>

<head>

<title>My JSP 'freechar.jsp' starting page</title>

<!--

-->

</head>

<body>

</body>

</html>

(4):jfreeChar与ireport结合和ireport使用自定义数据源。代码如下：

<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %>

<%@ page import="dori.jasper.engine.*" %>

<%@ page import="dori.jasper.engine.data.*" %>

<%@ page import="java.util.*" %>

<%@ page import="java.io.*" %>

<%@ page import="java.sql.*" %>

<%@ page import="test.jfree.*" %>

<%@ page import="java.awt.*" %>

<%@ page import="java.awt.image.*" %>

<%@ page import="org.jfree.chart.ChartFactory" %>

<%@ page import="org.jfree.data.DefaultCategoryDataset" %>

<%@ page import="org.jfree.data.CategoryDataset" %>

<%@ page import="org.jfree.chart.plot.PlotOrientation" %>

<%@ page import="org.jfree.chart.JFreeChart" %>

<%@ page import="test.data.*" %>

try

{

DefaultCategoryDataset dataset = new DefaultCategoryDataset();

dataset.addValue(100, "北京", "苹果");

dataset.addValue(100, "上海", "苹果");

dataset.addValue(100, "广州", "苹果");

dataset.addValue(200, "北京", "梨子");

dataset.addValue(200, "上海", "梨子");

dataset.addValue(200, "广州", "梨子");

dataset.addValue(300, "上海", "葡萄");

dataset.addValue(300, "广州", "葡萄");

dataset.addValue(400, "北京", "香蕉");

dataset.addValue(400, "上海", "香蕉");

dataset.addValue(400, "广州", "香蕉");

dataset.addValue(500, "北京", "荔枝");

dataset.addValue(500, "上海", "荔枝");

dataset.addValue(500, "广州", "荔枝");

JFreeChart chart=ChartFactory.createBarChart3D("水果产量图","水果", "产量",dataset,PlotOrientation.VERTICAL,true,false,false);

chart.setBackgroundPaint(new GradientPaint(0, 0, Color.WHITE, 1000, 0, Color.WHITE));

BufferedImage image = chart.createBufferedImage(400, 400);

/* */

Collection c=new ArrayList();

test.data.CustomBean cbb=new test.data.CustomBean("刘正仁",new Integer(22),"刘正仁"," bb");

c.add(cbb);

cbb=new test.data.CustomBean("老婆",new Integer(23),"f"," f");

c.add(cbb);

Map parameters = new HashMap();

parameters.put("ChartImage", image);

File reportFile = new File("F:/jfreechar/WebRoot/test.jasper");//这个文件是由ireport生成的.

if(reportFile.exists())

{

System.out.println("这个文件存在");

}

System.out.println(reportFile.getPath());

byte[] bytes = JasperRunManager.runReportToPdf(reportFile.getPath(),parameters,new JRBeanCollectionDataSource(c));

response.reset();

response.setContentType("application/pdf");

response.setContentLength(bytes.length);

ServletOutputStream ouputStream = response.getOutputStream();

ouputStream.write(bytes, 0, bytes.length);

ouputStream.flush();

ouputStream.close();

}catch(Exception ex)

{

ex.printStackTrace();

}

(5):动态table的使用。使用请见页面中以实现的代码

1:首选要在使用动态表的页面引入DynamicTable.js文件.

2:动态表中有如下性性在构造子中必须加入.

如:

var NewObject=new DynamicTable('NewObject',2,arr,arr1,'form1','Content',listValue,'del.gif');

第一个参数为对象的名称.

第二个参数数字为动态表默认的长度.

第三个参数为一个数组,指明表头和所占比例(只支持白分比)

如下: var arr=['列头1,10%','列头2,30%','列头3,30%','列头4,30%']; //列头名,宽度

第4个参数为控件的相关属性定义.为一数组,长度与第三个参数一致.

如:

var arr1=['delFlagMany,0,||','userName,20,||,text,del.gif||doNothing','userNike,12,||,text,,','userP,20,||,nothing']; //名,长度,值(||分开多个值),控件类型

目前控件支持 text, textarea, select，date，file和没有.

数组中第一个基本可以写死,第一项为多选框的名字前缀，后面会跟一个数字。第二个为长度，由于多选框没有长度，这项可以写为0,第三项为hiddenID的默认值,中间用||分开。

后面的参数为每个单元格中的输入控件。有4项，第一项为控件的名字前缀，第二项为控件长度，第三项为控件的默认值，第4项为控件的类型。第5项为控件后面是否带有选择按钮，其中按钮有路经和执行的javaScript的方法，他只能带有两个参数。

(5):多附件上传与struts结合。

1 使用（4）中的动态table,实现文件可以选择多个。

2 相应的action中的代码

package test;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.action.ActionForm;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.Action;

import org.apache.struts.upload.*;

import java.util.*;

import java.io.*;

public class TestS extends Action {

public ActionForward execute(ActionMapping actionMapping,

ActionForm actionForm,

HttpServletRequest servletRequest,

HttpServletResponse servletResponse) throws Exception{

//String test[] =((TestStruts)actionForm).getUsername();

//for(int i=0;i<test.length;i++)

//System.out.println(test[i]);

Hashtable files = actionForm.getMultipartRequestHandler().getFileElements();

System.out.println("files.size() :"+files.size() );

FormFile f[] = null;

f = new FormFile[files.size()];

String filePath = servletRequest.getContextPath();

System.out.println("filePath="+filePath);;

java.util.Enumeration fileKey = files.keys();

int i = 0;

String fname = "";

while (fileKey.hasMoreElements()) {

fname = (String) fileKey.nextElement();

System.out.println("fname="+fname);

f[i] = (FormFile) files.get(fname);

System.out.println("realNmae="+f[i].getFileName());

i++;

}

for (int a = 0; a < f.length; a++)

{

if (f[a] == null || f[a].getFileSize() == 0 || f[a].getFileName() == null ||

f[a].getFileName().equals("")) {

}

else {

InputStream stream = f[a].getInputStream();

OutputStream bos = new FileOutputStream("F:/work/ytstm/YTSTMWeb/" +

f[a].getFileName());//修改成上传文件存放路经

System.out.println("显示系统名" + f[a].getFileName()); //显示系统名

System.out.println("文件大小:" + f[a].getFileSize() ); //显示系统名

int bytesRead = 0;

byte[] buffer = new byte[8192];

while ((bytesRead = stream.read(buffer, 0, 8192)) != -1) {

bos.write(buffer, 0, bytesRead);

}

bos.close();

}

return actionMapping.findForward("test");

}

(5): 系统异常处理。

请在要处理异常的action中加入如下示例的代码:

<exception

handler="cotech.framework.web.BaseExceptionHandler"

key="global.error.systemprompt" path="/login.jsp" type="cotech.framework.exceptions.BaseException"/>

</action>

(6): 网页调用word打印。

<html>

<head>

<title>无标题文档</title>

response.setContentType("application/msword");

</head>

<%String flag=request.getParameter("flag");

System.out.println(flag);

<body >

<b>gffgdfgdfg</b>

</body>

</html>

(7):servlet中用itext生成pdf

package test;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.lowagie.text.Document;

import com.lowagie.text.DocumentException;

import com.lowagie.text.Font;

import com.lowagie.text.PageSize;

import com.lowagie.text.Paragraph;

import com.lowagie.text.pdf.BaseFont;

import com.lowagie.text.pdf.PdfWriter;

public class TestPdf extends HttpServlet {

public TestPdf() {

super();

}

/**

* Destruction of the servlet. <br>

public void destroy() {

super.destroy(); // Just puts "destroy" string in log

// Put your code here

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

try

{

response.setContentType("application/pdf");

BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);

Font FontChinese = new Font(bfChinese, 12, Font.NORMAL);

Document document=new Document(PageSize.A4, 0, 0, 12, 12);

ByteArrayOutputStream buffer = new ByteArrayOutputStream();

PdfWriter writer=PdfWriter.getInstance( document, buffer );

document.open();

//文档内容自己填充

document.add(new Paragraph("dfsfsdfffdsf中文vxcvxcv",FontChinese));

document.close();

System.out.println("dfsfsdfffdsf中文vxcvxcv");

byte[] bytes = buffer.toByteArray();

response.setContentLength(bytes.length);

ServletOutputStream ouputStream = response.getOutputStream();

ouputStream.write(bytes, 0, bytes.length);

ouputStream.flush();

ouputStream.close();

}

catch(Exception ex)

{

ex.printStackTrace();

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doGet(request,response);

}

/**

* Initialization of the servlet. <br>

* @throws ServletException if an error occure

public void init() throws ServletException {

// Put your code here

}

java小东东。 广东精鹰软件工作室(刘正仁)

java小东东。广东精鹰软件工作室(刘正仁)