如何合并/连接/联合两个具有相同列的.csv文件

Question

我想加入或你可以说在其他输出.csv文件中联合两个csv文件， 例如假设我有一个带字段的csv文件 A，B，C，d，电子 另一个有字段a，b，c，x，y，z 我需要输出文件中的输出 - a，b，c，d，e，x，y，z

我做了但没有获得所需的输出，请让我知道工作java代码

int n1 = 3,n2 = 3;//stores the serial number of the column that has the duplicate data
BufferedReader br1=new BufferedReader(new InputStreamReader(new FileInputStream("c:/test/report1.csv")));
BufferedReader br2=new BufferedReader(new InputStreamReader(new FileInputStream("c:/test/report2.csv")));
String line1,line2;
while((line1=br1.readLine())!=null && (line2=br2.readLine())!=null){
    String line=line1+","+line2;
    String newL="";
    StringTokenizer st=new StringTokenizer(line,",");
    System.out.println("total tokens "+st.countTokens());
    int i = 3;
    for(int i=1;i<=st.countTokens();i++){
        if((i==n1)||(i==n1+n2))
            continue;
        else
            newL=newL+","+st.nextToken();
    }

    String l=newL.substring(1);
    System.out.println("merged "+l);
    //write this line to the output file
}