水晶报表（crystal reports）--java

摘要: 个人总结

这两天项目要用水晶报表（crystal reports），上网查了下资料，网上的资料不是太多.

1.安装

首先用的时候先到官网（https://www.sap.com/china/product/analytics/crystal-reports-eclipse.html）下载插件（SAP Crystal Reports（Eclipse 版））集成到eclipse中 ，下载之后解压


将文件放到eclipse相应的文件夹下。重启eclipse！

2.建项目

eclipse右键新建项目，选择Crystal Reports Web Project



输入项目名



finaish,项目结构展示如下：



3.建立java取数和数据库连接

有两种方式

第一种：

1)

这个带出来的实例。CrystalReport1.rpt 可以在Eclipse直接去连接数据库表和视图。直接把
数据取出来不做任何修改的展示。
我这里使用POJO的方式来做报表。以满足日常中在JAVA做数据处理后。做报表的显示。
首先建立和数据库表一样名字的POJO Person.java

package com.businessobjects.samples;

import java.util.Date;

public class Person {
private int id;
private String t_name;
private String password;
private Date birthday;

public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getT_name() {
return t_name;
}
public void setT_name(String t_name) {
this.t_name = t_name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}

public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public Person() {
}

public Person(int id, String t_name, String password, Date birthday) {
super();
this.id = id;
this.t_name = t_name;
this.password = password;
this.birthday = birthday;
}
@Override
public String toString() {
return "Person [id=" + id + ", t_name=" + t_name + ", password="
+ password + ", birthday=" + birthday + "]";
}

}

建立与数据库连接的类

package com.businessobjects.samples;

import java.sql.Connection;
import java.sql.DriverManager;

public class DataBaseConnection {
private final String DBDRIBER ="com.mysql.jdbc.Driver";
private final String DBURL = "jdbc:mysql://IP:端口/数据库名称?useUnicode=true&characterEncoding=utf8";
private final String DBUSER = "用户";
private final String DBPASSWORD = "密码";
private Connection conn= null;
public DataBaseConnection(){
try{
Class.forName(DBDRIBER);
this.conn = DriverManager.getConnection(DBURL, DBUSER, DBPASSWORD);
}catch(Exception e){
e.printStackTrace();
}
}
public Connection getConnection(){
return this.conn;
}
public void close(){
try{
this.conn.close();
}catch(Exception e){
e.printStackTrace();
}
}
}

建立取数的DAO接口

package com.businessobjects.samples;

import java.util.List;

/**
* 取数据DAO接口
* @author Scaler_Zhang
*
*/
public interface IPersonDao {
/**
* 添加操作
* @param person 用户信息
* @throws Exception
*/
public void insert(Person person)throws Exception;
/**
* 更新操作
* @param person
* @throws Exception
*/
public void update(Person person)throws Exception;
/**
* 删除操作
* @param person
* @throws Exception
*/
public void delete(Person person)throws Exception;
/**
* 根据ID查询操作
* @param id
* @return
* @throws Exception
*/
public Person queryById(int id)throws Exception;
/**
* 查询全部
* @return persons
* @throws Exception
*/
public List queryAll() throws Exception;
/**
* 模糊查询
* @param cond
* @return persons
* @throws Exception
*/
public List queryByLike(String cond)throws Exception;
}

对接口写实现。该处只做QUERYALL的实现。作为示例

package com.businessobjects.samples;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

public class PersonDao implements IPersonDao {

public void insert(Person person) throws Exception {
// TODO Auto-generated method stub

}

public void update(Person person) throws Exception {
// TODO Auto-generated method stub

}

public void delete(Person person) throws Exception {
// TODO Auto-generated method stub

}

public Person queryById(int id) throws Exception {
// TODO Auto-generated method stub
return null;
}

public List queryAll() throws Exception {
List all = new ArrayList();
String sql = "select * from person";
PreparedStatement stat = null;
DataBaseConnection dbc = null;
try{
//连接数据库
dbc = new DataBaseConnection();
stat = dbc.getConnection().prepareStatement(sql);
ResultSet rst = stat.executeQuery();
while(rst.next()){
Person person = new Person();
person.setId(rst.getInt(1));
person.setT_name(rst.getString(2));
person.setPassword(rst.getString(3));
person.setBirthday(rst.getDate(4));
all.add(person);
}
}catch(Exception e){
e.printStackTrace();
throw new Exception("查询出现异常");
}finally{
dbc.close();
}
return all;
}

public List queryByLike(String cond) throws Exception {
// TODO Auto-generated method stub
return null;
}

}
这样整体就写完了。

2)建立报表

右击项目选择

建立一张空白报表。在报表视图里把下如蓝色标记的地方拖到 Data 的空白部分

设计报表一张简单的报表，从右侧选择要展示的字段，直接拖到展示的地方

选择如下



OK，生成jsp代码如下

<%@ page contentType="text/html; charset=UTF-8" pageEncoding="ISO-8859-1" %><%@ page import="com.crystaldecisions.report.web.viewer.CrystalReportViewer,
com.crystaldecisions.sdk.occa.report.application.OpenReportOptions,
com.crystaldecisions.sdk.occa.report.application.ReportClientDocument,
com.crystaldecisions.sdk.occa.report.lib.ReportSDKExceptionBase" %><%
// This sample code calls methods from the CRJavaHelper class, which
// contains examples of how to use the BusinessObjects APIs. You are free to
// modify and distribute the source code contained in the CRJavaHelper class.

try {

String reportName = "Person.rpt";
ReportClientDocument clientDoc = (ReportClientDocument) session.getAttribute(reportName);

if (clientDoc == null) {
// Report can be opened from the relative location specified in the CRConfig.xml, or the report location
// tag can be removed to open the reports as Java resources or using an absolute path
// (absolute path not recommended for Web applications).

clientDoc = new ReportClientDocument();
clientDoc.setReportAppServer(ReportClientDocument.inprocConnectionString);

// Open report
clientDoc.open(reportName, OpenReportOptions._openAsReadOnly);

// ****** BEGIN POPULATE WITH RESULTSET SNIPPET ****************
{
// This option is not applicable for the report you have chosen
}
// ****** END POPULATE WITH RESULTSET SNIPPET ****************

// ****** BEGIN POPULATE WITH POJO SNIPPET ****************
{
// This option is not applicable for the report you have chosen
}
// ****** END POPULATE WITH POJO SNIPPET ****************

// Store the report document in session
session.setAttribute(reportName, clientDoc);

}

// ****** BEGIN CONNECT CRYSTALREPORTPAGEVIEWER SNIPPET ****************
{
// Create the CrystalReportViewer object
CrystalReportViewer crystalReportPageViewer = new CrystalReportViewer();

String reportSourceSessionKey = reportName+"ReportSource";
Object reportSource = session.getAttribute(reportSourceSessionKey);
if (reportSource == null)
{
reportSource = clientDoc.getReportSource();
session.setAttribute(reportSourceSessionKey, reportSource);
}
// set the reportsource property of the viewer
crystalReportPageViewer.setReportSource(reportSource);

// Apply the viewer preference attributes

// Process the report
crystalReportPageViewer.processHttpRequest(request, response, application, null);

}
// ****** END CONNECT CRYSTALREPORTPAGEVIEWER SNIPPET ****************

} catch (ReportSDKExceptionBase e) {
out.println(e);
}

%>

运行项目访问页面就可以看到展示的报表了

第二种：
https://my.oschina.net/u/2391879/blog/886847