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2.6.4 基本对象设计
按照面向对象的分析与设计方法的基本思想，“万物皆对象”，把“对象”作为解决问题的重心。根据测算系统的具体分析情况，系统主要对象有用户、教学单位、课程、公共参数、经费等。
1.用户对象Users
用户对象代表登录用户。从前面的图2-1用例图可以看到，系统用户划分成三类：学校领导和财务处为一类，除了拥有财务处的全部权限以外，还具有“确定分配基数”权限；教务处为第二类用户，除了拥有教学单位的全部权限以外，还具有“调整模型参数权限”；教学单位为第三类用户，具有测算经费、查看作为测算结果的Excel报表权限。说明：本书为了简化处理，在具体实现测算系统时将学校领导、财务处和教务处设置为相同权限。该对象代码如下。
package cn.edu.jfcs.model;
public class Users {
private int id; //记录ID
private String username; //用户名
private String password; //密码
private String usertag; //用户类别
public int getId() {return id;}
public void setId(int id) {this.id = id;}
public String getPassword() {return password;}
public void setPassword(String password) {this.password = password;}
public String getUsername() {return username;}
public void setUsername(String username) {this.username = username;}
public String getUsertag() {return usertag;}
public void setUsertag(String usertag) {this.usertag = usertag;}
}
2.课程对象Course
Course是指用户在本地操作所涉及的课程对象，该对象比较简单，代码如下。
package cn.edu.jfcs.model;
import java.math.BigDecimal;
public class Course {
private int id; //记录ID
private String term; //学期
private int nian; //年份
private String unitid; //教学单位代码
private String courseid; //课程代码
private String coursetype; //课程类别
private String coursename; //课程名称
private String classname; //班级名称
private int nj; //学生数
private int n2j; //学时数
private BigDecimal r1j; //学生层次系数
private BigDecimal r2j; //课程或专业系数
private BigDecimal r3j; //课程质量系数
private TeachUnit teachunit; //所属的教学单位
public String getClassname() {return classname;}
public void setClassname(String classname){this.classname=classname;}
public String getCourseid() {return courseid;}
public void setCourseid(String courseid) {this.courseid = courseid;}
public String getCoursename() {return coursename;}
public void setCoursename(String coursename){this.coursename=coursename;}
public String getCoursetype() {return coursetype;}
public void setCoursetype(String coursetype){this.coursetype=coursetype;}
public int getId() {return id;}
public void setId(int id) {this.id = id;}
public int getN2j() {return n2j;}
public void setN2j(int n2j) {this.n2j = n2j;}
public int getNian() {return nian;}
public void setNian(int nian) {this.nian = nian;}
public int getNj() {return nj;}
public void setNj(int nj) {this.nj = nj;}
public BigDecimal getR1j() {return r1j;}
public void setR1j(BigDecimal r1j) {this.r1j = r1j;}
public BigDecimal getR2j() {return r2j;}
public void setR2j(BigDecimal r2j) {this.r2j = r2j;}
public BigDecimal getR3j() {return r3j;}
public void setR3j(BigDecimal r3j) {this.r3j = r3j;}
public TeachUnit getTeachunit() {return teachunit; }
public void setTeachunit(TeachUnit teachunit){this.teachunit=teachunit;}
public String getTerm() {return term;}
public void setTerm(String term) {this.term = term;}
public String getUnitid() {return unitid;}
public void setUnitid(String unitid) {this.unitid = unitid;}
}
这里有一个很奇怪的地方，各种系数是否要用BigDecimal类型？更恰当的类型似乎应该是float类型。这实际上涉及到精确度问题。如果采用float类型，输入的数值1.2在屏幕上可能会变成1.18。如果计算10.0～9.0，结果可能是0.999，而不是1.0！使用BigDecimal则可以执行精确小数运算，从而解决该问题。另外，代码中的teachunit属性表示该课程所属的教学单位对象，该对象后面将有说明。
3.经费对象Calcresult
本来并不需要经费对象，因为全部经费数据都可以通过计算得到。但是考虑到各教学单位查询较为频繁，为了避免每次查询均需要计算一次，因此特别设计了经费对象。实际上，用于保存测算结果的数据量比较小，牺牲这点儿空间换取较高的性能还是值得的。该对象类代码如下。
package cn.edu.jfcs.model;
public class Calcresult {
private int id; //记录ID
private int nian; //年份
private String unitid; //教学单位ID
private float ui; //学生经费
private float pi; //专业培养费
private float ci; //公共课经费
private float ryjf; //人员经费
private float zhywf; //综合业务费
private TeachUnit teachunit; //所属教学单位
public float getCi() {return ci;}
public void setCi(float ci) {this.ci = ci;}
public int getId() {return id;}
public void setId(int id) {this.id = id;}
public int getNian() {return nian;}
public void setNian(int nian) {this.nian = nian;}
public String getUnitid() {return unitid;}
public void setUnitid(String unitid) {this.unitid = unitid;}
public float getPi() {return pi;}
public void setPi(float pi) {this.pi = pi;}
public float getRyjf() { return ryjf;}
public void setRyjf(float ryjf) {this.ryjf = ryjf;}
public float getUi() {return ui;}
public void setUi(float ui) {this.ui = ui;}
public TeachUnit getTeachunit() { return teachunit;}
public void setTeachunit(TeachUnit teachunit) {this.teachunit = teachunit;}
public float getZhywf() {return zhywf;}
public void setZhywf(float zhywf) {this.zhywf = zhywf;}
}
4.教学数据库服务器上的课程信息对象CourseInfo
CourseInfo对应远程教学数据库服务器上的课程对象，本书所使用的教学数据库服务器为MySQL 5.0。该对象类代码如下。
package cn.edu.jfcs.model;
public class CourseInfo {
private int id; //记录ID
private String term; //学期
private int nian; //年份
private String unitid; //教学单位代码
private String courseid; //课程代码
private String coursename; //课程名称
private String coursetype; //课程类别
private String classname; //班级名称
private int nj; //学生数
private int n2j; //学时数
public String getClassname() {return classname;}
public void setClassname(String classname){this.classname=classname;}
public String getCourseid() {return courseid;}
public void setCourseid(String courseid) {this.courseid = courseid;}
public String getCoursename() {return coursename;}
public void setCoursename(String coursename){this.coursename=coursename;}
public String getCoursetype() {return coursetype;}
public void setCoursetype(String coursetype){this.coursetype=coursetype;}
public int getId() {return id;}
public void setId(int id) {this.id = id;}
public int getN2j() {return n2j;}
public void setN2j(int n2j) {this.n2j = n2j;}
public int getNian() {return nian;}
public void setNian(int nian) {this.nian = nian;}
public int getNj() {return nj;}
public void setNj(int nj) {this.nj = nj;}
public String getTerm() {return term;}
public void setTerm(String term) {this.term = term;}
public String getUnitid() {return unitid;}
public void setUnitid(String unitid) {this.unitid = unitid;}
}
5.公共参数对象PubData
公共参数对象与全校全局测算参数有关，代码如下。
package cn.edu.jfcs.model;
import java.math.BigDecimal;
public class PubData {
private int id; //记录ID
private int nian; //年份
private BigDecimal mt; //年度拟拨付总额
private BigDecimal rte; //全校本年应收金额
private BigDecimal mte; //全校本年实收金额
private BigDecimal sjf; //全校缴费率标准
private BigDecimal uper; //学生经费分割比
private BigDecimal pper; //专业培养费分割比
private BigDecimal cper; //公共课经费分割比
private BigDecimal jcjper; //奖酬金比率
private BigDecimal xsknbzper; //学生困难补助比率
private BigDecimal xshdjfper; //学生活动经费比率
private BigDecimal xsjxjper; //学生奖学金比率
private BigDecimal tb1; //教授A系数
private BigDecimal tb2; //教授B系数
private BigDecimal tb3; //教授C系数
private BigDecimal tb4; //教授D系数
private BigDecimal tb5; //副教授A系数
private BigDecimal tb6; //副教授B系数
private BigDecimal tb7; //讲师
private BigDecimal tb8; //助教
public BigDecimal getCper() {return cper;}
public void setCper(BigDecimal cper) { this.cper = cper;}
public int getId() {return id;}
public void setId(int id) {this.id = id;}
public BigDecimal getJcjper() {return jcjper;}
public void setJcjper(BigDecimal jcjper) {this.jcjper = jcjper;}
public BigDecimal getMt() {return mt;}
public void setMt(BigDecimal mt) {this.mt = mt;}
public BigDecimal getMte() {return mte;}
public void setMte(BigDecimal mte) {this.mte = mte;}
public int getNian() {return nian;}
public void setNian(int nian) {this.nian = nian;}
public BigDecimal getPper() {return pper;}
public void setPper(BigDecimal pper) { this.pper = pper;}
public BigDecimal getRte() {return rte;}
public void setRte(BigDecimal rte) {this.rte = rte;}
public BigDecimal getSjf() {return sjf;}
public void setSjf(BigDecimal sjf) {this.sjf = sjf;}
public BigDecimal getTb1() {return tb1;}
public void setTb1(BigDecimal tb1) {this.tb1 = tb1;}
public BigDecimal getTb2() {return tb2;}
public void setTb2(BigDecimal tb2) {this.tb2 = tb2;}
public BigDecimal getTb3() {return tb3;}
public void setTb3(BigDecimal tb3) {this.tb3 = tb3;}
public BigDecimal getTb4() {return tb4;}
public void setTb4(BigDecimal tb4) {this.tb4 = tb4;}
public BigDecimal getTb5() {return tb5;}
public void setTb5(BigDecimal tb5) {this.tb5 = tb5;}
public BigDecimal getTb6() {return tb6;}
public void setTb6(BigDecimal tb6) {this.tb6 = tb6;}
public BigDecimal getTb7() {return tb7;}
public void setTb7(BigDecimal tb7) {this.tb7 = tb7;}
public BigDecimal getTb8() {return tb8;}
public void setTb8(BigDecimal tb8) {this.tb8 = tb8;}
public BigDecimal getUper() {return uper;}
public void setUper(BigDecimal uper){this.uper = uper;}
public BigDecimal getXshdjfper() {return xshdjfper;}
public void setXshdjfper(BigDecimal xshdjfper){this.xshdjfper=xshdjfper;}
public BigDecimal getXsjxjper() {return xsjxjper;}
public void setXsjxjper(BigDecimal xsjxjper) {this.xsjxjper = xsjxjper;}
public BigDecimal getXsknbzper() {return xsknbzper;}
public void setXsknbzper(BigDecimal xsknbzper){this.xsknbzper=xsknbzper;}
}
6.教学单位年度基本数据对象YearTeachUnit
该对象用来描述教学单位本身的基本状态信息。不同年份各教学单位的基本数据可能不同。例如，某个教学单位在不同年份的状态信息，是否有专业课、公共课是否可能发生变化，比如经济管理学院2006年只有专业课，但2007年可能开设企业管理全校公共课。其次，众所周知的事情，某个教学单位在不同年份的经费相关信息经常发生变化。例如，不同职称的教师人数、师生比、教学业务费、师资培养费等。代码如下。
package cn.edu.jfcs.model;
import java.math.BigDecimal;
public class YearTeachUnit {
private int id; //记录ID
private int nian; //年份
private String unitid; //教学单位ID
private String haszyk; //是否有专业课
private String hasggk; //是否有公共课
private int ssb; //师生比
private BigDecimal jfys; //学费应收金额
private BigDecimal jfss; //学费实收金额
private BigDecimal jxywper; //教学业务费比例
private BigDecimal jxglper; //教学管理费比例
private BigDecimal jxyjper; //教学研究费比例
private BigDecimal szpyper; //师资培养费比例
private int ta1; //教授A等人数
private int ta2; //教授B等人数
private int ta3; //教授C等人数
private int ta4; //教授D等人数
private int ta5; //副教授A等人数
private int ta6; //副教授B等人数
private int ta7; //讲师人数
private int ta8; //助教人数
private TeachUnit teachunit; //所属教学单位
public String getHasggk() {return hasggk;}
public void setHasggk(String hasggk) {this.hasggk = hasggk;}
public String getHaszyk() {return haszyk;}
public void setHaszyk(String haszyk) {this.haszyk = haszyk;}
public int getId() {return id;}
public void setId(int id) {this.id = id;}
public BigDecimal getJfss() {return jfss;}
public void setJfss(BigDecimal jfss) {this.jfss = jfss;}
public BigDecimal getJfys() {return jfys;}
public void setJfys(BigDecimal jfys) {this.jfys = jfys;}
public BigDecimal getJxglper() {return jxglper;}
public void setJxglper(BigDecimal jxglper) {this.jxglper = jxglper;}
public BigDecimal getJxyjper() {return jxyjper;}
public void setJxyjper(BigDecimal jxyjper) {this.jxyjper = jxyjper;}
public BigDecimal getJxywper() {return jxywper;}
public void setJxywper(BigDecimal jxywper) {this.jxywper = jxywper;}
public int getNian() {return nian;}
public void setNian(int nian) {this.nian = nian;}
public int getSsb() {return ssb;}
public void setSsb(int ssb) {this.ssb = ssb;}
public BigDecimal getSzpyper() {return szpyper;}
public void setSzpyper(BigDecimal szpyper) {this.szpyper = szpyper;}
public int getTa1() {return ta1;}
public void setTa1(int ta1) {this.ta1 = ta1;}
public int getTa2() {return ta2;}
public void setTa2(int ta2) {this.ta2 = ta2;}
public int getTa3() {return ta3;}
public void setTa3(int ta3) {this.ta3 = ta3;}
public int getTa4() {return ta4;}
public void setTa4(int ta4) {this.ta4 = ta4;}
public int getTa5() {return ta5;}
public void setTa5(int ta5) {this.ta5 = ta5;}
public int getTa6() {return ta6;}
public void setTa6(int ta6) {this.ta6 = ta6;}
public int getTa7() {return ta7;}
public void setTa7(int ta7) {this.ta7 = ta7;}
public int getTa8() {return ta8;}
public void setTa8(int ta8) {this.ta8 = ta8;}
public TeachUnit getTeachunit() {return teachunit;}
public void setTeachunit(TeachUnit teachunit){this.teachunit=teachunit;}
public String getUnitid() {return unitid;}
public void setUnitid(String unitid) {this.unitid = unitid;}
}
7.教学单位对象
无论哪个学校，都有教学单位的基本信息，如教学单位代码、教学单位名称。对于共性部分，可以统一在接口之下，并用一个抽象类统一实现接口中的公共属性。具体介绍如下。
（1）接口类ITeachUnit的代码如下所示。
package cn.edu.jfcs.model;
public interface ITeachUnit {
public String getUnitid();
public void setUnitid(String unitid);
public String getUnitname();
public void setUnitname(String unitname);
}
（2）抽象类AbstractTeachUnit的代码如下所示。
package cn.edu.jfcs.model;
public abstract class AbstractTeachUnit implements ITeachUnit {
private String unitid; //教学单位ID
private String unitname; //教学单位名称
public String getUnitid() {return unitid;}
public String getUnitname() {return unitname;}
public void setUnitid(String unitid) {this.unitid = unitid;}
public void setUnitname(String unitname) {this.unitname = unitname;}
}
（3）教学单位对象类TeachUnit的代码如下所示。
package cn.edu.jfcs.model;
public class TeachUnit extends AbstractTeachUnit {
private int id; //记录ID
public int getId() {return id;}
public void setId(int id) {this.id = id;}
}
8.用户登录对象SaveLogInfo
SaveLogInfo通常用于临时保存登录信息，该对象实际上完全可以不需要，是一个“冗余”对象。这里创建该对象的目的纯粹是为了处理方便，其代码如下。
package cn.edu.jfcs.model;
public class SaveLogInfo {
private String username; //用户名
private String password; //密码
private String usertag; //用户类别
private static SaveLogInfo INSTANCE=new SaveLogInfo();
private SaveLogInfo() {}
public static SaveLogInfo getInstance() {return INSTANCE;}
public String getPassword() {return password;}
public void setPassword(String password) {this.password = password;}
public String getUsername() {return username;}
public void setUsername(String username) {this.username = username;}
public String getUsertag() {return usertag;}
public void setUsertag(String usertag) { this.usertag = usertag;}
}