废话不多说，直接上代码，网上代码都不能用，迫不得已，最后查询了官网的源码。上菜！

模板文件可以自己去github去下载。

package com.aspose.words.examples.mail_merge;

import com.aspose.words.Document;
import com.aspose.words.FieldMergingArgs;
import com.aspose.words.IFieldMergingCallback;
import com.aspose.words.ImageFieldMergingArgs;
import com.aspose.words.net.System.Data.DataRow;
import com.aspose.words.net.System.Data.DataTable;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;

//ExStart:
public class InsertImagesFromADatabase {

private static final String dataDir = "D:\\\\works\\\\IdeaProjects\\\\Aspose.Words-for-Java\\\\Examples\\\\src\\\\main\\\\resources\\\\";  
private static final String path = dataDir + "MailMerge\\\\";  

public static void main(String\[\] args) throws Exception {  
    Document doc = new Document(path + "MailMerge.MergeImage.doc");  
    // Set up the event handler for image fields.  
    doc.getMailMerge().setFieldMergingCallback(new HandleMergeImageFieldFromBlob());  
    Map<String, Object> map = new HashMap<>(16);  
    map.put("FirstName","测试第一名称");  
    map.put("LastName","测试最后名称");  
    map.put("Title","测试标题");  
    map.put("Address","测试地址");  
    map.put("City","测试城市");  
    map.put("Country","测试国家");  
    map.put("PhotoBLOB", Base64.getEncoder ().encodeToString(toByteArray3("D:\\\\test.jpeg")));  
    DataTable table = new DataTable("Employees");  
    DataRow dataRow = table.newRow();  
    map.forEach((k,v) -> {  
        table.getColumns().add(k);  
        dataRow.set(k,v);  
    });  
    table.getRows().add(dataRow);  
    //DataTable table = new DataTable(resultSet, "Employees");  
    // Perform mail merge.  
    doc.getMailMerge().executeWithRegions(table);  

    // Close the database.  
   // conn.close();  

    doc.save(path + "MailMerge.MergeImage Out.doc");  
}  

/\*\*  
 \* 把ResultSet转化成map对象  
 \*  
 \* @param rs  
 \* @return  
 \* @throws SQLException  
 \*/  
public static Map<String, Object> Result2Map(ResultSet rs)  
        throws SQLException {  
    Map<String, Object> hm = new HashMap<>(16);  
    ResultSetMetaData rsmd = rs.getMetaData();  
    int count = rsmd.getColumnCount();  
    if (rs.next()) {  
        for (int i = 1; i <= count; i++) {  
            String key = rsmd.getColumnName(i);  
            Object value = rs.getString(i);  
            hm.put(key, value);  
        }  
        return hm;  
    }  
    return null;  
}  

public static byte\[\] toByteArray3(String filename) throws IOException {  

    FileChannel fc = null;  
    try {  
        fc = new RandomAccessFile(filename, "r").getChannel();  
        MappedByteBuffer byteBuffer = fc.map(FileChannel.MapMode.READ\_ONLY, 0,  
                fc.size()).load();  
        System.out.println(byteBuffer.isLoaded());  
        byte\[\] result = new byte\[(int) fc.size()\];  
        if (byteBuffer.remaining() > 0) {  
            // System.out.println("remain");  
            byteBuffer.get(result, 0, byteBuffer.remaining());  
        }  
        return result;  
    } catch (IOException e) {  
        e.printStackTrace();  
        throw e;  
    } finally {  
        try {  
            fc.close();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
    }  
}  

}

class HandleMergeImageFieldFromBlob implements IFieldMergingCallback {
@Override
public void fieldMerging(FieldMergingArgs args) throws Exception {
// Do nothing.
}

/\*\*  
 \* This is called when mail merge engine encounters Image:XXX merge  
 \* field in the document. You have a chance to return an Image object,  
 \* file name or a stream that contains the image.  
 \*/  
@Override  
public void imageFieldMerging(ImageFieldMergingArgs e) throws Exception {  
    // The field value is a byte array, just cast it and create a stream on it.  
    System.out.println(e);  
    if (e.getFieldValue() != null) {  
        ByteArrayInputStream imageStream = new ByteArrayInputStream(Base64.getDecoder ().decode (e.getFieldValue ().toString ()));  
        // Now the mail merge engine will retrieve the image from the stream.  
        e.setImageStream(imageStream);  
    }  
}  

}
//ExEnd: