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Java利用反射对list对象做过滤

目录

  • 1.对象结构
  • 2.根据字段名获取value
  • 3.对list过滤
  • 4.精确匹配
  • 5.模糊匹配
Java利用反射对list对象做过滤
文章图片

?反射对效率有影响 慎用！！！?

1.对象结构
public class BusinessDept {private String year; //年private String month; //月private String deptName; //部门名称private String deptLeader; //部门负责人private Double jyz; //经营值private Double rev; //收入private Double exp; //支出private Double tWorkTime; //填报工时private Double sWorkTime; //标准工时private Double param; //经营参数public void setYear(String year) {this.year = year; }public void setMonth(String month) {this.month = month; }public void setDeptName(String deptName) {this.deptName = deptName; }public void setDeptLeader(String deptLeader) {this.deptLeader = deptLeader; }public void setJyz(Double jyz) {this.jyz = jyz; }public String getYear() {return year; }public String getMonth() {return month; }public String getDeptName() {return deptName; }public String getDeptLeader() {return deptLeader; }public Double getJyz() {return jyz; }public Double getRev() {return rev; }public Double getExp() {return exp; }public Double gettWorkTime() {return tWorkTime; }public Double getsWorkTime() {return sWorkTime; }public Double getParam() {return param; }public void setRev(Double rev) {this.rev = rev; }public void setExp(Double exp) {this.exp = exp; }public void settWorkTime(Double tWorkTime) {this.tWorkTime = tWorkTime; }public void setsWorkTime(Double sWorkTime) {this.sWorkTime = sWorkTime; }public void setParam(Double param) {this.param = param; }public E get(String name) {Class cl = this.getClass(); Field[] fields = cl.getDeclaredFields(); try {for (Field field : fields) {field.setAccessible(true); if (field.getName().equals(name)) {return (E) field.get(this); }}} catch (IllegalAccessException e) {e.printStackTrace(); }return null; }}


2.根据字段名获取value
public E get(String name) {Class cl = this.getClass(); Field[] fields = cl.getDeclaredFields(); try {for (Field field : fields) {field.setAccessible(true); if (field.getName().equals(name)) {return (E) field.get(this); }}} catch (IllegalAccessException e) {e.printStackTrace(); }return null; }


3.对list过滤
List businessDeptList = this.myQuery(); //筛选符合条件的listif (businessDeptList.size()>0){businessDeptList = this.filterExact("year",year,businessDeptList); businessDeptList = this.filterExact("month",month,businessDeptList); businessDeptList = this.filterVague("deptName",deptName,businessDeptList); businessDeptList = this.filterVague("deptLeader",deptLeader,businessDeptList); if(!StringUtils.isEmpty(jyz)){businessDeptList = this.filterExact("jyz",Double.parseDouble(jyz),businessDeptList); }if(!StringUtils.isEmpty(param)){businessDeptList = this.filterExact("param",Double.parseDouble(param),businessDeptList); }if(!StringUtils.isEmpty(sWorkTime)){businessDeptList = this.filterExact("sWorkTime",Double.parseDouble(sWorkTime),businessDeptList); }if(!StringUtils.isEmpty(rev)){businessDeptList = this.filterExact("rev",Double.parseDouble(rev),businessDeptList); }if(!StringUtils.isEmpty(exp)){businessDeptList = this.filterExact("exp",Double.parseDouble(exp),businessDeptList); }if(!StringUtils.isEmpty(tWorkTime)){businessDeptList = this.filterExact("tWorkTime",Double.parseDouble(tWorkTime),businessDeptList); }}


4.精确匹配
//精确匹配private List filterExact(String name,T t,List businessDepts){if(t.toString().isEmpty()){return businessDepts; }List list = new ArrayList(); if(businessDepts.size()>0){for(int i = 0; i

5.模糊匹配
//模糊匹配private List filterVague(String name,String s,List businessDepts){if(s.isEmpty()){return businessDepts; }List list = new ArrayList(); if(businessDepts.size()>0){for(int i = 0; i
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