整体比较
有时候，我们想比对两个word文档，标记出两个文档之间的差异，这样一眼就能看出来修改了哪些地方，如下图,左边文档中的扩招2000人删除了，辞呈改成了说明，新增了并且加重处罚等文字，是否一目了然了。
代码实现:
package cn.hollycloud;
import lombok.AllArgsConstructor;
import lombok.Data;
import org.apache.commons.text.diff.CommandVisitor;
import org.apache.commons.text.diff.EditScript;
import org.apache.commons.text.diff.StringsComparator;
import org.apache.poi.xwpf.extractor.XWPFWordExtractor;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.junit.jupiter.api.Test;
import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.List;
public class DocTest {
@Test
public void testCompare() {
try {
// 读取word文档
XWPFDocument doc1 = new XWPFDocument(new FileInputStream("D:\\doc\\1.docx"));
XWPFDocument doc2 = new XWPFDocument(new FileInputStream("D:\\doc\\2.docx"));
// 获取文档文本内容
XWPFWordExtractor extractor1 = new XWPFWordExtractor(doc1);
String content1 = extractor1.getText();
XWPFWordExtractor extractor2 = new XWPFWordExtractor(doc2);
String content2 = extractor2.getText();
// 关闭流
doc1.close();
doc2.close();
// commons-text api有很大调整，请注意你使用的版本，我使用的版本为1.11.0
StringsComparator comparator = new StringsComparator(content1, content2);
EditScript<Character> script = comparator.getScript();
SectionDiffCommandVisitor commandVisitor = new SectionDiffCommandVisitor();
script.visit(commandVisitor);
commandVisitor.finish();
System.out.println(commandVisitor.getLeftTemp());
System.out.println(commandVisitor.getRightTemp());
} catch (Exception e) {
e.printStackTrace();
}
}
// 源文本上显示变化内容
static class SectionDiffCommandVisitor implements CommandVisitor<Character> {
private List<String> leftContents = new ArrayList<>();
private List<String> rightContents = new ArrayList<>();
private StringBuilder leftTemp = new StringBuilder();
private StringBuilder rightTemp = new StringBuilder();
private int lastTag = 0; //0:keep,1:insert,2:delete
private String insertStart = "<em>";
private String insertEnd = "</em>";
private String deleteStart = "<del>";
private String deleteEnd = "</del>";
@Override
public void visitDeleteCommand(Character object) {
if (lastTag == 1) {
rightTemp.append(insertEnd);
leftTemp.append(deleteStart);
} else if (lastTag == 0) {
leftTemp.append(deleteStart);
}
leftTemp.append(object);
lastTag = 2;
}
@Override
public void visitInsertCommand(Character object) {
if (lastTag == 2) {
leftTemp.append(deleteEnd);
rightTemp.append(insertStart);
} else if (lastTag == 0) {
rightTemp.append(insertStart);
}
rightTemp.append(object);
lastTag = 1;
}
@Override
public void visitKeepCommand(Character object) {
finish(object);
}
public void finish() {
finish(null);
}
private void finish(Object object) {
if (lastTag == 1) {
rightTemp.append(insertEnd);
} else if (lastTag == 2) {
leftTemp.append(deleteEnd);
}
if (object != null) {
leftTemp.append(object);
rightTemp.append(object);
}
lastTag = 0;
}
public StringBuilder getLeftTemp() {
return leftTemp;
}
public StringBuilder getRightTemp() {
return rightTemp;
}
}
}
列出变化的片段
如果一个文档很长，这样比对效率就比较低了，我们只需要看有差异的片段，下面我用《赡养人类》这部小说尝试，修改了里面部分内容，列出了修改的片段，效果还不错
代码:
package cn.hollycloud;
import lombok.AllArgsConstructor;
import lombok.Data;
import org.apache.commons.text.diff.CommandVisitor;
import org.apache.commons.text.diff.EditScript;
import org.apache.commons.text.diff.StringsComparator;
import org.apache.poi.xwpf.extractor.XWPFWordExtractor;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.junit.jupiter.api.Test;
import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
public class DocTest {
@Test
public void testCompare() {
try {
// 读取word文档
XWPFDocument doc1 = new XWPFDocument(new FileInputStream("D:\\doc\\1.docx"));
XWPFDocument doc2 = new XWPFDocument(new FileInputStream("D:\\doc\\2.docx"));
// 获取文档文本内容
XWPFWordExtractor extractor1 = new XWPFWordExtractor(doc1);
String content1 = extractor1.getText();
XWPFWordExtractor extractor2 = new XWPFWordExtractor(doc2);
String content2 = extractor2.getText();
// 关闭流
doc1.close();
doc2.close();
// commons-text api有很大调整，请注意你使用的版本，我使用的版本为1.11.0
StringsComparator comparator = new StringsComparator(content1, content2);
EditScript<Character> script = comparator.getScript();
SectionDiffCommandVisitor commandVisitor = new SectionDiffCommandVisitor();
script.visit(commandVisitor);
commandVisitor.finish();
List<DiffSection> diffSections = commandVisitor.getDiffSections();
for (int i = 0; i < diffSections.size(); i++) {
System.out.println("差分内容#" + (i + 1) + ": ");
System.out.println(diffSections.get(i).getLeftContent());
System.out.println(diffSections.get(i).getRightContent());
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Data
public static class DiffSection {
private String leftContent;
private String rightContent;
}
// 源文本上显示变化内容
static class SectionDiffCommandVisitor implements CommandVisitor<Character> {
private List<DiffSection> diffSections = new ArrayList<>();
private StringBuilder leftTemp = new StringBuilder();
private StringBuilder rightTemp = new StringBuilder();
private int lastTag = 0; //0:keep,1:insert,2:delete
private String insertStart = "<em>";
private String insertEnd = "</em>";
private String deleteStart = "<del>";
private String deleteEnd = "</del>";
private Pattern pattern = Pattern.compile("[。\\r?\\n\\.]");
private boolean hasChange = false;
@Override
public void visitDeleteCommand(Character object) {
if (lastTag == 1) {
rightTemp.append(insertEnd);
leftTemp.append(deleteStart);
} else if (lastTag == 0) {
leftTemp.append(deleteStart);
}
leftTemp.append(object);
lastTag = 2;
hasChange = true;
}
@Override
public void visitInsertCommand(Character object) {
if (lastTag == 2) {
leftTemp.append(deleteEnd);
rightTemp.append(insertStart);
} else if (lastTag == 0) {
rightTemp.append(insertStart);
}
rightTemp.append(object);
lastTag = 1;
hasChange = true;
}
@Override
public void visitKeepCommand(Character object) {
finish(object);
}
public void finish() {
finish(null);
}
private void finish(Object object) {
if (lastTag == 1) {
rightTemp.append(insertEnd);
} else if (lastTag == 2) {
leftTemp.append(deleteEnd);
}
if (object != null) {
leftTemp.append(object);
rightTemp.append(object);
}
// 到句子末尾
if (object == null || pattern.matcher(object.toString()).find()) {
if (hasChange && (isLegalStr(leftTemp.toString()) || isLegalStr(rightTemp.toString()))) {
DiffSection diffSection = new DiffSection();
diffSection.setLeftContent(leftTemp.toString());
diffSection.setRightContent(rightTemp.toString());
diffSections.add(diffSection);
}
leftTemp.setLength(0);
rightTemp.setLength(0);
hasChange = false;
}
lastTag = 0;
}
private boolean isLegalStr(String str) {
if (StringUtils.isEmpty(str)) return false;
String cleaned = str.replaceAll("[\\p{P}\\s]+", "")
.replace(insertStart, "").replace(insertEnd, "")
.replace(deleteStart, "").replace(deleteEnd, "");
return !StringUtils.isEmpty(cleaned);
}
public List<DiffSection> getDiffSections() {
return diffSections;
}
}
}
