java生成csv格式的文件

原文：http://blog.163.com/zhuqingqing_2010/blog/static/1716296512012521114415755/

导入commons-beanutils.jar

<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.8.0</version>
</dependency>

示范：

import java.io.BufferedWriter;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.beanutils.BeanUtils;

public class CSVUtils {

public static File createCSVFile(List exportData, LinkedHashMap rowMapper,
String outPutPath, String filename) {

File csvFile = null;
BufferedWriter csvFileOutputStream = null;
try {
csvFile = new File(outPutPath + filename + ".csv");
// csvFile.getParentFile().mkdir();
File parent = csvFile.getParentFile();
if (parent != null && !parent.exists()) {
parent.mkdirs();
}
csvFile.createNewFile();

// GB2312使正确读取分隔符","
csvFileOutputStream = new BufferedWriter(new OutputStreamWriter(
new FileOutputStream(csvFile), "GB2312"), 1024);
// 写入文件头部
for (Iterator propertyIterator = rowMapper.entrySet().iterator(); propertyIterator
.hasNext();) {
java.util.Map.Entry propertyEntry = (java.util.Map.Entry) propertyIterator
.next();
csvFileOutputStream.write("\""
+ propertyEntry.getValue().toString() + "\"");
if (propertyIterator.hasNext()) {
csvFileOutputStream.write(",");
}
}
csvFileOutputStream.newLine();

// 写入文件内容
for (Iterator iterator = exportData.iterator(); iterator.hasNext();) {
Object row = (Object) iterator.next();
System.out.println(row);

for (Iterator propertyIterator = ((LinkedHashMap)row).entrySet().iterator(); propertyIterator.hasNext();) {
java.util.Map.Entry propertyEntry = (java.util.Map.Entry) propertyIterator.next();
System.out.println( BeanUtils.getProperty(row, propertyEntry.getKey().toString()));
csvFileOutputStream.write("\""
+  propertyEntry.getValue().toString() + "\"");
if (propertyIterator.hasNext()) {
csvFileOutputStream.write(",");
}
}
if (iterator.hasNext()) {
csvFileOutputStream.newLine();
}
}
csvFileOutputStream.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
csvFileOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return csvFile;
}

public static void main(String[] args) {
List exportData = new ArrayList<Map>();
Map row1 = new LinkedHashMap<String, String>();
row1.put("1", "11");
row1.put("2", "12");
row1.put("3", "13");
row1.put("4", "14");
exportData.add(row1);
row1 = new LinkedHashMap<String, String>();
row1.put("1", "21");
row1.put("2", "22");
row1.put("3", "23");
row1.put("4", "24");
exportData.add(row1);
List propertyNames = new ArrayList();
LinkedHashMap map = new LinkedHashMap();
map.put("1", "第一列");
map.put("2", "第二列");
map.put("3", "第三列");
map.put("4", "第四列");
CSVUtils.createCSVFile(exportData, map, "d:/aaaaaa/mmm/", "活动目录");
}
}

结果:

用记事本打开：



用Excel打开：