在網上搜索了很多JasperReport報表開發的例子,基本上都是說的一些理論知識,沒有一個直接用代碼直觀表達的,想必大家想學習jasperReport報表的開始,都希望能夠直觀的看到代碼,研究出代碼執行後的效果是什麼,而不是一大堆的理論,說這些對於剛開始學的有毛用,還不如直接看代碼,在代碼中多寫點註釋來的快。
本文用的是JasperReport最新版本6.0
JasperReport官網:community.jaspersoft.com
web開發建議下載JasperReports library --> jasperreports-xxx-project 裏面包含demo以及api
項目結構:
jar包:新手可以把下載下來的所有jar包都放進去,熟練之後可以根據自己所需加入相關jar包
WebRoot下:新建reports文件夾,用來存放jrxml、jasper文件;build.xml(放入進去之後會出現螞蟻圖標);
jrxml文件代碼,此代碼是xml格式文件,可以自己手寫,也可以安裝 iReport設計編譯成jasper文件,爲了入門下面純手寫
DbReport.jrxml:
<span style="font-size:14px;"><?xml version="1.0" encoding="UTF-8" ?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports
http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="DbReport" >
<!-- jasperReport標籤中name="DbReport"需要對應外面文件名, $P{}爲填充參數,$V{}爲值 ,$F{}爲查詢值或者爲Jr數據-->
<!-- 頁面樣式標籤 --屬性:
forecolor(前景色,就是文本)
backcolor(背景色)
hAlign(水平位置Center, Justified, Left, Right)
vAlign(垂直位置Bottom, Middle, Top)
border(邊框1Point, 2Point, 4Point, Dotted, None, Thin)
borderColor(邊框顏色)
fontName(字體)
fontSize(字體大小)
isBold,isItalic,IsUnderline,isStrikeThrough(粗體,斜體,下畫線,..)
lineSpacing(1_1_2, Double, Single行間距)
rotation(旋轉,Left, None, Right,轉的是90度)
isStyledText(指示這個Element是否用Style,true,false)
isDefault(說明這個樣式是否默認樣式)
-->
<style name="pageHeader" forecolor="#FFFFFF" backcolor="#333333"/>
<!-- 參數標籤 -->
<parameter name="userName" class="java.lang.String"/>
<!-- 查詢語句標籤 -->
<queryString>
<![CDATA[
select id,user_name as name,email,qq from user where user_name=$P{userName}
]]>
</queryString>
<!-- 顯示字段標籤 -->
<field name="id" class="java.lang.Integer" />
<field name="name" class="java.lang.String" />
<field name="email" class="java.lang.String" />
<field name="qq" class="java.lang.String" />
<pageHeader>
<band height="30">
<staticText>
<reportElement style="pageHeader" x="0" y="5" width="55" height="15"/>
<textElement textAlignment="Center"/>
<text><![CDATA[ID]]></text>
</staticText>
<staticText>
<reportElement style="pageHeader" x="55" y="5" width="205" height="15"/>
<text><![CDATA[Name]]></text>
</staticText>
<staticText>
<reportElement style="pageHeader" x="160" y="5" width="255" height="15"/>
<text><![CDATA[Email]]></text>
</staticText>
<staticText>
<reportElement style="pageHeader" x="260" y="5" width="255" height="15"/>
<text><![CDATA[QQ]]></text>
</staticText>
</band>
</pageHeader>
<!-- 顯示內容-->
<detail>
<band height="20">
<textField>
<reportElement x="0" y="4" width="50" height="15"/>
<textElement textAlignment="Right"/>
<textFieldExpression><![CDATA[$F{id}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true">
<reportElement positionType="Float" x="55" y="4" width="100" height="15"/>
<textFieldExpression><![CDATA[$F{name}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true">
<reportElement positionType="Float" x="160" y="4" width="100" height="15"/>
<textFieldExpression><![CDATA[$F{email}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true">
<reportElement positionType="Float" x="260" y="4" width="255" height="15"/>
<textFieldExpression><![CDATA[$F{qq}]]></textFieldExpression>
</textField>
<line>
<reportElement positionType="Float" x="0" y="19" width="515" height="1" forecolor="#808080"/>
</line>
</band>
</detail>
</jasperReport>
</span>
後臺代碼:TestServlet.java
<span style="font-size:14px;">package servlets;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.sql.ResultSet;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import util.JDBC;
import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JRResultSetDataSource;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperExportManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.JasperRunManager;
import net.sf.jasperreports.engine.data.JRMapArrayDataSource;
import net.sf.jasperreports.engine.export.JRHtmlExporter;
import net.sf.jasperreports.engine.export.JRHtmlExporterParameter;
import net.sf.jasperreports.engine.export.JRPdfExporter;
import net.sf.jasperreports.engine.export.JRXlsExporter;
import net.sf.jasperreports.engine.export.JRXlsExporterParameter;
import net.sf.jasperreports.engine.util.JRLoader;
import net.sf.jasperreports.view.JasperViewer;
public class TestServlet extends HttpServlet {
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try{
ServletContext context = this.getServletConfig().getServletContext();
//JasperCompileManager 編譯管理器
//JasperFillManager 填充管理器
//JRXmlLoader xml加載器
//JasperPrintManager 打印管理器
//JasperExportManager 導出管理器
//JasperRunManager 運行管理器
JasperCompileManager.compileReportToFile(context.getRealPath("/reports/DbReport.jrxml"));//編譯jrxml文件,生成jasper文件
Map map=new HashMap();//參數map
map.put("userName", "admin");
//生成jrprint文件
//JasperFillManager.fillReportToFile(context.getRealPath("/reports/DbReport.jasper"), map, JDBC.conn);
File jasperFile=new File(context.getRealPath("/reports/DbReport.jasper"));
JasperReport jasperReport =(JasperReport)JRLoader.loadObject(jasperFile);
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, map,JDBC.conn);
//將查詢的數據填充到報表中
//String sql="select id,user_name as name,email,qq from user";
//ResultSet rs=JDBC.getResultSet(sql);
//JRResultSetDataSource jr=new JRResultSetDataSource(rs);
//JasperFillManager.fillReportToFile(context.getRealPath("/reports/DbReport.jasper"), map, jr);
//JDBC.closeAll(rs, JDBC.statement, null);//關閉數據連接
//JasperRunManager.runReportToHtmlFile(context.getRealPath("/reports/DbReport.jasper"), map, JDBC.conn);
//JasperRunManager.runReportToHtmlFile(context.getRealPath("/reports/DbReport.jasper"), map, jr);
//生成html文件
//JasperRunManager.runReportToHtmlFile(context.getRealPath("/reports/DbReport.jasper"), "E:/test.html", map, JDBC.conn);
//InputStream inputStream=getServletConfig().getServletContext().getResourceAsStream(context.getRealPath("/reports/DbReport.jasper"));
//JasperRunManager.runReportToPdfStream(inputStream, response.getOutputStream(), map, jr);
//-----以map數組爲數據源,生成html文件
JasperRunManager.runReportToHtmlFile(context.getRealPath("/reports/DbReport.jasper"), "E:/test2.html", map, getReportDataSource());
//生成html數據
/*
JRHtmlExporter html = new JRHtmlExporter();
html.setParameter(JRHtmlExporterParameter.JASPER_PRINT, jasperPrint);
html.setParameter(JRHtmlExporterParameter.OUTPUT_WRITER,response.getWriter());
html.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN,Boolean.FALSE);
html.setParameter(JRExporterParameter.CHARACTER_ENCODING, "utf-8");
html.exportReport();
*/
//生成excel
/*
JRXlsExporter xls=new JRXlsExporter();
xls.setParameter(JRXlsExporterParameter.JASPER_PRINT, jasperPrint);
xls.setParameter(JRXlsExporterParameter.OUTPUT_STREAM, response.getOutputStream());
xls.setParameter(JRXlsExporterParameter.IS_ONE_PAGE_PER_SHEET, Boolean.FALSE);
xls.setParameter(JRXlsExporterParameter.IS_WHITE_PAGE_BACKGROUND, Boolean.FALSE);
response.setHeader("Content-Disposition", "attachment;filename=first.xls");
response.setContentType("application/vnd_ms-excel");
xls.exportReport();
*/
//生成pdf
/*
JRPdfExporter pdf = new JRPdfExporter();
pdf.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
pdf.setParameter(JRExporterParameter.OUTPUT_STREAM, response.getOutputStream());
response.setHeader("Content-Disposition", "attachment;filename=first.pdf");
response.setContentType("application/pdf");
response.setCharacterEncoding("UTF-8");
pdf.exportReport();
*/
}catch(Exception e){
e.printStackTrace();
}
}
private JRDataSource getReportDataSource(){
//new JRMapArrayDataSource(getMaparray());這裏也可以傳自定義對象數組,對象屬性字段必須對應DbReport.jrxml中顯示數據字段
JRMapArrayDataSource dataSource=new JRMapArrayDataSource(getMaparray());
return dataSource;
}
private Map[] getMaparray(){
//map key鍵必須對應DbReport.jrxml中顯示數據字段
Map map1=new HashMap();
map1.put("id", 1);
map1.put("name", "aaa");
map1.put("email", "[email protected]");
map1.put("qq", "111");
Map map2=new HashMap();
map2.put("id", 2);
map2.put("name", "bbb");
map2.put("email", "[email protected]");
map2.put("qq", "222");
Map map3=new HashMap();
map3.put("id", 3);
map3.put("name", "ccc");
map3.put("email", "[email protected]");
map3.put("qq", "333");
Map[] mapArray=new Map[3];
mapArray[0]=map1;
mapArray[1]=map2;
mapArray[2]=map3;
return mapArray;
}
}
</span>
JDBC:
<span style="font-size:14px;">package util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class JDBC {
public static String driver="com.mysql.jdbc.Driver";
public static String url="jdbc:mysql://localhost:3306/myapp";
public static String user="root";
public static String pwd="root";
public static Connection conn=getConnection();
public static Statement statement=getStatement();
private static Connection getConnection(){
if(conn==null){
try{
Class.forName(driver);
conn=DriverManager.getConnection(url,user,pwd);
}catch(Exception e){
e.printStackTrace();
}
}
return conn;
}
private static Statement getStatement(){
if(statement==null){
try{
statement=conn.createStatement();
}catch(Exception e){
e.printStackTrace();
}
}
return statement;
}
public static ResultSet getResultSet(String sql){
ResultSet rs=null;
try{
rs=statement.executeQuery(sql);
}catch(Exception e){
e.printStackTrace();
}
return rs;
}
public static void closeAll(ResultSet rs,Statement st,Connection cn){
try{
if(rs!=null){
rs.close();
}
if(st!=null){
st.close();
}
if(cn!=null){
cn.close();
}
}catch(Exception e){
e.printStackTrace();
}
}
}
</span>
執行效果:html數據
頁面的樣式是可以通過jrxml文件的配置的,手寫肯定不太好看,iReport是jasperReport的可視化工具,可以下載 iReport工具來設計。
上面代碼保存之後,代碼前面可能會多出<span>標籤