水晶报表for java_水晶报表（crystal reports）--java

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

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