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优化代码实现

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lxyer 2018-07-07 13:36:10 +08:00
parent fb9e72365f
commit e719a6e055
6 changed files with 212 additions and 161 deletions
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5
README.md
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@ -3,6 +3,5 @@
### 功能
1. poi的导入导出 支持多sheet导出,详见代码 ExcelKit
2. 非poi导出，导出数据量理论无上限；导出数据类型不限制List<T>(JDK8+),
如果是jdk7及以下版本，未做支持（需要修改部分代码）
3、支持excel压缩导出节约网络资源
如果是jdk7及以下版本，未做支持（需要修改部分代码）
3. 支持excel压缩导出节约网络资源

8
pom.xml
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@ -33,10 +33,18 @@
<artifactId>poi-ooxml</artifactId>
<version>3.17</version>
</dependency>
<dependency>
<groupId>org.redkale</groupId>
<artifactId>redkale</artifactId>
<version>1.9.3</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>servlet-api</artifactId>
<version>6.0.37</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>junit</groupId>

102
src/excel/ExcelExportKit.java
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@ -1,41 +1,36 @@
package excel;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Field;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.function.BiFunction;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
/**
* Created by liangxianyou at 2018/6/27 16:15.
*/
public class ExcelExportKit {
public static void main(String[] args) throws IOException {
}
public static final ThreadLocal<SimpleDateFormat> SDF_THREADLOCAL = new ThreadLocal<>();
//-------------非poi导出---------------
private static <T> String exportExcel(Map<String, String> head, List<T> rows, BiFunction fun) {
public static <T,U,R> StringBuilder exportExcel(Map<String, String> head, List<T> rows, BiFunction<T,U,R> fun) {
long start = System.currentTimeMillis();
StringBuffer buf = new StringBuffer();
StringBuilder buf = new StringBuilder();
buf.append(EXCEL_HEAD);
buf.append(createBody(head, rows, fun));//body
buf.append(EXCEL_END);
System.out.println(String.format("数据：%s条，耗时：%s ms", rows.size(), System.currentTimeMillis() - start));
return buf.toString();
return buf;
}
private static <T> StringBuffer createBody(Map<String, String> head, List<T> rows, BiFunction fun) {
StringBuffer buf = new StringBuffer();
private static <T,U,R> StringBuilder createBody(Map<String, String> head, List<T> rows, BiFunction<T,U,R> fun) {
StringBuilder buf = new StringBuilder();
//table-head
buf.append("<Row ss:StyleID=\"s50\" ss:Height=\"16\">");
head.forEach((k,v)->{
@ -47,13 +42,18 @@ public class ExcelExportKit {
rows.forEach(x->{
buf.append("<Row>");
head.forEach((k,v)->{
Object value = fun.apply(x, v);
Object value = fun.apply(x, (U)v);
if (value == null) value = "";
if (value instanceof Number){
buf.append("<Cell><Data ss:Type=\"Number\">"+value+"</Data> </Cell>");
}else if (value instanceof Date){
buf.append("<Cell><Data ss:Type=\"Date\">"+
new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(value) +
"</Data> </Cell>"
SimpleDateFormat dateFormat = SDF_THREADLOCAL.get();
if (dateFormat == null) {//ThreadLocal 存贮 simpleDateFormat 对象
SDF_THREADLOCAL.set(dateFormat = new SimpleDateFormat());
}
buf.append(
"<Cell><Data ss:Type=\"String\">"+ dateFormat.format(value) +"</Data> </Cell>"
);
}else {
buf.append("<Cell><Data ss:Type=\"String\">"+value+"</Data> </Cell>");
@ -65,69 +65,10 @@ public class ExcelExportKit {
return buf;
}
public static <T> void exportExcel(Map<String,String> head, List<T> rows, File file, BiFunction fun) throws IOException {
strToFile(exportExcel(head, rows, fun), file);
}
public static <T,U,R> void exportExceltoFile(Map<String,String> head, List<T> rows, File file, BiFunction<T,U,R> fun) throws IOException {
StringBuilder buf = exportExcel(head, rows, fun);
/**
* excel 压缩导出
* @param head
* @param rows
* @param file
* @param fun
* @param <T>
* @throws IOException
*/
public static <T> void exportExcelZip(Map<String,String> head, List<T> rows, File file, BiFunction fun) throws IOException {
ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(file));
BufferedOutputStream bos = new BufferedOutputStream(zos);
ZipEntry zipEntry = new ZipEntry(file.getName().split("[.]")[0]+".xls");
zos.putNextEntry(zipEntry);
bos.write(exportExcel(head, rows, fun).getBytes());
bos.flush();
bos.close();
zos.close();
}
/*
//使用redkale框架情况下的 导出
public static <T> boolean exportExcel(Map head, List<T> rows, HttpResponse response, String xlsName, BiFunction fun) throws IOException {
xlsName = new String(xlsName.getBytes("utf-8"),"iso-8859-1")+ ".xls";
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", "attachment;filename="+xlsName);
response.finish(exportExcel(head, rows, fun).getBytes());
return true;
}*/
/**
* 非poi导出excel--【javax.servlet】
* @param head 表头
* @param rows 数据
* @param request
* @param response
* @param xlsName 导出的文件名称
* @return
* @throws IOException
*/
public static <T> boolean exportExcel(Map head, List<T> rows, HttpServletRequest request, HttpServletResponse response, String xlsName, BiFunction fun) throws IOException {
if(request.getHeader("user-agent") != null && request.getHeader("user-agent").indexOf("MSIE") != -1) {
xlsName = java.net.URLEncoder.encode(xlsName,"utf-8") + ".xls";
} else {
xlsName = new String(xlsName.getBytes("utf-8"),"iso-8859-1")+ ".xls";
}
OutputStream os = response.getOutputStream();
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", "attachment;filename="+xlsName);
os.write(exportExcel(head, rows, fun).getBytes());
return true;
strToFile(buf.toString(), file);
}
public static void strToFile(String entityBody, File file) throws IOException {
@ -141,7 +82,6 @@ public class ExcelExportKit {
out.close();
}
public static class TC {
public static final BiFunction BEAN = (t,u)->{
Field field = null;

168
test/excel/ExportKitTest.java Normal file
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@ -0,0 +1,168 @@
package excel;
import org.junit.Test;
import org.redkale.net.http.HttpResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.*;
import java.util.concurrent.CountDownLatch;
import java.util.function.BiFunction;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
/**
* 以下均为非poi导出使用示例
* 1、导出List<javabean>示例
* 2、导出List<Map> 示例
* 3、javax.servlet web项目中开发使用示例
* 4、导出压缩的excel示例
* 5、redkale web项目导出示例
*
* Created by liangxianyou at 2018/7/6 10:29.
*/
public class ExportKitTest {
//1、导出List<javabean>示例
@Test
public void exportBean(){
Map<String, String> heads = new LinkedHashMap();
heads.put("姓名", "name");
heads.put("年龄", "age");
heads.put("生日", "bir");
int total = 5_0000;
List rows = new ArrayList<>(total);
Random random = new Random();
for (int i = 0; i < total; i++) {
String name = UUID.randomUUID().toString();
int age = random.nextInt(100);
rows.add(new Person(name, age, new Date()));
}
File file = new File("target/user.xls");
if (file.exists()) file.delete();
try {
ExcelExportKit.exportExceltoFile(heads, rows, file, ExcelExportKit.TC.BEAN);
} catch (IOException e) {
e.printStackTrace();
}
}
//2、导出List<Map> 示例
@Test
public void exportMapToZip(){
Map<String, String> heads = new LinkedHashMap();
heads.put("姓名", "name");
heads.put("姓名1", "name1");
heads.put("姓名2", "name2");
heads.put("年龄", "age");
int total = 5_0000;
List<Map> rows = new ArrayList<>(total);
Map r1 = new HashMap();
r1.put("name", "张三");
r1.put("age", 12);
rows.add(r1);
Random random = new Random();
//使用uuid 模拟复杂数据导出
for (int i = 0; i < total; i++) {
Map r2 = new HashMap();
r2.put("name", UUID.randomUUID());
r2.put("name1", UUID.randomUUID());
r2.put("name2", UUID.randomUUID());
r2.put("age", random.nextInt(100));
rows.add(r2);
}
File file = new File("target/hello.zip");
if (file.exists()) file.delete();
try {
exportExcelZip(heads, rows, file, ExcelExportKit.TC.MAP);
} catch (IOException e) {
e.printStackTrace();
}
}
//==================项目中使用示例，实际项目根据实际情况拷贝修改使用========================
/**
* 3、javax.servlet web项目中开发使用示例
* @param head 表头
* @param rows 数据
* @param request
* @param response
* @param xlsName 导出的文件名称
* @return
* @throws IOException
*/
public <T> boolean exportExcel(Map head, List<T> rows, HttpServletRequest request, HttpServletResponse response, String xlsName, BiFunction fun) throws IOException {
if(request.getHeader("user-agent") != null && request.getHeader("user-agent").indexOf("MSIE") != -1) {
xlsName = java.net.URLEncoder.encode(xlsName,"utf-8") + ".xls";
} else {
xlsName = new String(xlsName.getBytes("utf-8"),"iso-8859-1")+ ".xls";
}
CountDownLatch latch = new CountDownLatch(187);
latch.countDown();
OutputStream os = response.getOutputStream();
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", "attachment;filename="+xlsName);
os.write(ExcelExportKit.exportExcel(head, rows, fun).toString().getBytes());
return true;
}
/**
* 4、导出压缩的excel示例
* @param head
* @param rows
* @param file
* @param fun
* @param <T>
* @throws IOException
*/
public <T,U,R> void exportExcelZip(Map<String,String> head, List<T> rows, File file, BiFunction<T, U, R> fun) throws IOException {
ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(file));
BufferedOutputStream bos = new BufferedOutputStream(zos);
ZipEntry zipEntry = new ZipEntry(file.getName().split("[.]")[0]+".xls");
zos.putNextEntry(zipEntry);
StringBuilder buf = ExcelExportKit.exportExcel(head, rows, fun);
bos.write(buf.toString().getBytes());
bos.flush();
bos.close();
zos.close();
}
/**
* 5、redkale web项目导出示例
* @param head
* @param rows
* @param response
* @param xlsName
* @param fun
* @return
* @throws IOException
*/
public static <T,U,R> void exportExcel(Map head, List<T> rows, HttpResponse response, String xlsName, BiFunction<T,U,R> fun) throws IOException {
xlsName = new String(xlsName.getBytes("utf-8"),"iso-8859-1")+ ".xls";
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", "attachment;filename="+xlsName);
StringBuilder buf = ExcelExportKit.exportExcel(head, rows, fun);
response.finish(buf.toString().getBytes());
}
}

76
test/excel/ExportTest.java
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@ -1,76 +0,0 @@
package excel;
import org.junit.Test;
import java.io.File;
import java.io.IOException;
import java.util.*;
/**
* Created by liangxianyou at 2018/7/6 10:29.
*/
public class ExportTest {
@Test
public void exportBean(){
Map<String, String> heads = new LinkedHashMap();
heads.put("姓名", "name");
heads.put("年龄", "age");
int total = 5_0000;
List rows = new ArrayList<>(total);
Random random = new Random();
for (int i = 0; i < total; i++) {
String name = UUID.randomUUID().toString();
int age = random.nextInt(100);
rows.add(new Person(name, age));
}
File file = new File("target/user.zip");
if (file.exists()) file.delete();
try {
ExcelExportKit.exportExcelZip(heads, rows, file, ExcelExportKit.TC.BEAN);
} catch (IOException e) {
e.printStackTrace();
}
}
@Test
public void exportMapToZip(){
Map<String, String> heads = new LinkedHashMap();
heads.put("姓名", "name");
heads.put("姓名1", "name1");
heads.put("姓名2", "name2");
heads.put("年龄", "age");
int total = 5_0000;
List<Map> rows = new ArrayList<>(total);
Map r1 = new HashMap();
r1.put("name", "张三");
r1.put("age", 12);
rows.add(r1);
Random random = new Random();
//使用uuid 模拟复杂数据导出
for (int i = 0; i < total; i++) {
Map r2 = new HashMap();
r2.put("name", UUID.randomUUID());
r2.put("name1", UUID.randomUUID());
r2.put("name2", UUID.randomUUID());
r2.put("age", random.nextInt(100));
rows.add(r2);
}
File file = new File("target/hello.zip");
if (file.exists()) file.delete();
try {
ExcelExportKit.exportExcelZip(heads, rows, file, ExcelExportKit.TC.MAP);
} catch (IOException e) {
e.printStackTrace();
}
}
}

14
test/excel/Person.java
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@ -1,18 +1,22 @@
package excel;
import java.util.Date;
/**
* Created by liangxianyou at 2018/7/6 10:28.
*/
public class Person {
private String name;
private int age;
private Date bir;
public Person() {
}
public Person(String name, int age) {
public Person(String name, int age, Date bir) {
this.name = name;
this.age = age;
this.bir = bir;
}
public String getName() {
@ -30,4 +34,12 @@ public class Person {
public void setAge(int age) {
this.age = age;
}
public Date getBir() {
return bir;
}
public void setBir(Date bir) {
this.bir = bir;
}
}