public class StaffUnionVO implements RowMapper
      
       , Serializable {    private static final long serialVersionUID = 1544023434308856628L;    public StaffUnionVO() {    }　　private String code;// 员工编码　　    private String name;// 员工姓名  　　public String getCode() {        return code;    }    public void setCode(String code) {        this.code = code;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }private boolean isExistColumn(ResultSet rs, String columnName) {        try {            if (rs.findColumn(columnName) > 0) {                return true;            }        } catch (SQLException e) {            return false;        }        return false;    }    @Override    public StaffUnionVO mapRow(ResultSet rs, int row) throws SQLException {        StaffUnionVO vo = new StaffUnionVO();     　　　　if (isExistColumn(rs, "code"))            vo.setCode(rs.getString("code")); 　　　　if (isExistColumn(rs, "name"))            vo.setName(rs.getString("name"));        　　　　return vo;    }}
      

public class StaffUnionVO implements Serializable {    private static final long serialVersionUID = 1544023434308856628L;    public StaffUnionVO() {    }    private String code;// 员工编码    private String name;// 员工姓名    public String getCode() {        return code;    }    public void setCode(String code) {        this.code = code;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }}

/*** Eclipse Class Decompiler plugin, copyright (c) 2016 Chen Chao (cnfree2000@hotmail.com) ***/package org.springframework.jdbc.core;import java.beans.PropertyDescriptor;import java.sql.ResultSet;import java.sql.ResultSetMetaData;import java.sql.SQLException;import java.util.HashMap;import java.util.HashSet;import java.util.Map;import java.util.Set;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.springframework.beans.BeanUtils;import org.springframework.beans.BeanWrapper;import org.springframework.beans.NotWritablePropertyException;import org.springframework.beans.PropertyAccessorFactory;import org.springframework.beans.TypeMismatchException;import org.springframework.dao.DataRetrievalFailureException;import org.springframework.dao.InvalidDataAccessApiUsageException;import org.springframework.jdbc.support.JdbcUtils;import org.springframework.util.Assert;import org.springframework.util.StringUtils;public class BeanPropertyRowMapper
      
        implements RowMapper
       
         {    protected final Log logger = LogFactory.getLog(super.getClass());    private Class
        
          mappedClass;    private boolean checkFullyPopulated = false;    private boolean primitivesDefaultedForNullValue = false;    private Map
         
           mappedFields;    private Set
          
            mappedProperties;    public BeanPropertyRowMapper() {    }    public BeanPropertyRowMapper(Class
           
             mappedClass) { initialize(mappedClass); } public BeanPropertyRowMapper(Class
            
              mappedClass, boolean checkFullyPopulated) { initialize(mappedClass); this.checkFullyPopulated = checkFullyPopulated; } public void setMappedClass(Class
             
               mappedClass) { if (this.mappedClass == null) { initialize(mappedClass); } else if (!(this.mappedClass.equals(mappedClass))) throw new InvalidDataAccessApiUsageException( new StringBuilder().append("The mapped class can not be reassigned to map to ").append(mappedClass) .append(" since it is already providing mapping for ").append(this.mappedClass).toString()); } protected void initialize(Class
              
                mappedClass) { this.mappedClass = mappedClass; this.mappedFields = new HashMap(); this.mappedProperties = new HashSet(); PropertyDescriptor[] pds = BeanUtils.getPropertyDescriptors(mappedClass); for (PropertyDescriptor pd : pds) if (pd.getWriteMethod() != null) { this.mappedFields.put(pd.getName().toLowerCase(), pd); String underscoredName = underscoreName(pd.getName()); if (!(pd.getName().toLowerCase().equals(underscoredName))) { this.mappedFields.put(underscoredName, pd); } this.mappedProperties.add(pd.getName()); } }　　//在大写的字符前加入下滑线 private String underscoreName(String name) { if (!(StringUtils.hasLength(name))) { return ""; } StringBuilder result = new StringBuilder(); result.append(name.substring(0, 1).toLowerCase()); for (int i = 1; i < name.length(); ++i) { String s = name.substring(i, i + 1); String slc = s.toLowerCase(); if (!(s.equals(slc))) { result.append("_").append(slc); } else { result.append(s); } } return result.toString(); } public final Class
               
                 getMappedClass() { return this.mappedClass; } public void setCheckFullyPopulated(boolean checkFullyPopulated) { this.checkFullyPopulated = checkFullyPopulated; } public boolean isCheckFullyPopulated() { return this.checkFullyPopulated; } public void setPrimitivesDefaultedForNullValue(boolean primitivesDefaultedForNullValue) { this.primitivesDefaultedForNullValue = primitivesDefaultedForNullValue; } public boolean isPrimitivesDefaultedForNullValue() { return this.primitivesDefaultedForNullValue; } public T mapRow(ResultSet rs, int rowNumber) throws SQLException { Assert.state(this.mappedClass != null, "Mapped class was not specified"); Object mappedObject = BeanUtils.instantiate(this.mappedClass); BeanWrapper bw = PropertyAccessorFactory.forBeanPropertyAccess(mappedObject); initBeanWrapper(bw); ResultSetMetaData rsmd = rs.getMetaData(); int columnCount = rsmd.getColumnCount(); Set populatedProperties = (isCheckFullyPopulated()) ? new HashSet() : null;//稀少的特性 for (int index = 1; index <= columnCount; ++index) { String column = JdbcUtils.lookupColumnName(rsmd, index); PropertyDescriptor pd = (PropertyDescriptor) this.mappedFields .get(column.replaceAll(" ", "").toLowerCase()); if (pd == null) continue; try { Object value = getColumnValue(rs, index, pd); if ((this.logger.isDebugEnabled()) && (rowNumber == 0)) this.logger.debug( new StringBuilder().append("Mapping column '").append(column).append("' to property '") .append(pd.getName()).append("' of type ").append(pd.getPropertyType()).toString()); try { bw.setPropertyValue(pd.getName(), value); } catch (TypeMismatchException e) { if ((value == null) && (this.primitivesDefaultedForNullValue)) { this.logger.debug(new StringBuilder().append("Intercepted TypeMismatchException for row ") .append(rowNumber).append(" and column '").append(column).append("' with value ") .append(value).append(" when setting property '").append(pd.getName()) .append("' of type ").append(pd.getPropertyType()).append(" on object: ") .append(mappedObject).toString()); } else { throw e; } } if (populatedProperties != null) { populatedProperties.add(pd.getName()); } } catch (NotWritablePropertyException ex) { throw new DataRetrievalFailureException(new StringBuilder().append("Unable to map column ") .append(column).append(" to property ").append(pd.getName()).toString(), ex); } } if ((populatedProperties != null) && (!(populatedProperties.equals(this.mappedProperties)))) { throw new InvalidDataAccessApiUsageException(new StringBuilder() .append("Given ResultSet does not contain all fields necessary to populate object of class [") .append(this.mappedClass).append("]: ").append(this.mappedProperties).toString()); } return mappedObject; } protected void initBeanWrapper(BeanWrapper bw) { } protected Object getColumnValue(ResultSet rs, int index, PropertyDescriptor pd) throws SQLException { return JdbcUtils.getResultSetValue(rs, index, pd.getPropertyType()); } public static 
                
                  BeanPropertyRowMapper
                 
                   newInstance(Class
                  
                    mappedClass) { BeanPropertyRowMapper newInstance = new BeanPropertyRowMapper(); newInstance.setMappedClass(mappedClass); return newInstance; }}
                  
                 
                
               
              
             
            
           
          
         
        
       
      

　　AbstractSet.java public boolean equals(Object o) {        if (o == this)            return true;        if (!(o instanceof Set))            return false;        Collection
       c = (Collection
      ) o;        if (c.size() != size())            return false;        try {            return containsAll(c);        } catch (ClassCastException unused)   {            return false;        } catch (NullPointerException unused) {            return false;        }    }